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Q5341.
The sides of a rectangle are in the ratio of 3 : 8 and its area is 1944 cm2. What is its perimeter?
एक आयत की भुजाएँ 3 : 8 के अनुपात में हैं और इसका क्षेत्रफल 1944 cm2 है। इसका परिमाप कितना है?
  1. A189 cm
  2. B208 cm
  3. C198 cm
  4. D308 cm
Show answer

Concept: Sides 3k and 8k; area =24k2; perimeter =2(l+b).

  1. 24k2=1944⇒k2=81⇒k=9
  2. Sides =27cm and 72cm
  3. Perimeter =2(27+72)=198cm

Trick: Perimeter =2×11k=22k=22×9=198.

Answer: (C) 198 cm

अवधारणा: भुजाएँ 3k और 8k; क्षेत्रफल =24k2; परिमाप =2(l+b)।

  1. 24k2=1944⇒k2=81⇒k=9
  2. भुजाएँ =27cm और 72cm
  3. परिमाप =2(27+72)=198cm

ट्रिक: परिमाप =2×11k=22k=22×9=198।

उत्तर: (C) 198 cm

SSC CPO Paper IQuantitative AptitudeMensuration – RectangleSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5342.
A and B complete a work in 24 and 30 days, respectively, working 10 hours per day. The work is to be done in two shifts. The morning shift is for 6 hours and the evening shift is for 4 hours. On the first day, A works in the morning and B works in the
evening, and they interchange their shifts every day. On which day did the work get completed?
प्रतिदिन 10 घंटे कार्य करते हुए A और B एक कार्य को क्रमशः 24 और 30 दिनों में पूरा करते हैं। कार्य दो पालियों में किया जाना है। सुबह की पाली 6 घंटे की और शाम की पाली 4 घंटे की है। पहले दिन, A सुबह कार्य करता है और B
शाम को कार्य करता है, और वे प्रतिदिन अपनी पालियाँ आपस में बदल लेते हैं। कार्य किस दिन पूरा हुआ?
  1. A21st day21वें दिन
  2. B24th day24वें दिन
  3. C30th day30वें दिन
  4. D27th day27वें दिन
Show answer

Concept: Convert to hours: A needs 24×10=240 h, B needs 30×10=300 h; total work = LCM =1200 units.

  1. Efficiency: A =5, B =4 units/hour
  2. Odd day: 6×5+4×4=46; even day: 6×4+4×5=44; 2 days =90
  3. 26 days =13×90=1170; remaining =30
  4. Day 27 morning: A does 6×5=30 — work over on the 27th day

Trick: Always check whether the last part fits inside a single shift.

Answer: (D) 27th day

अवधारणा: घंटों में बदलें: A को 24×10=240 घंटे, B को 30×10=300 घंटे; कुल कार्य = LCM =1200 इकाई।

  1. दक्षता: A =5, B =4 इकाई/घंटा
  2. विषम दिन: 6×5+4×4=46; सम दिन: 6×4+4×5=44; 2 दिन =90
  3. 26 दिन =13×90=1170; शेष =30
  4. 27वें दिन सुबह: A करता है 6×5=30 — कार्य 27वें दिन पूरा

ट्रिक: हमेशा देखें कि अंतिम बचा कार्य किस शिफ्ट में पूरा होता है।

उत्तर: (D) 27वाँ दिन

SSC CPO Paper IQuantitative AptitudeTime & Work – Alternate ShiftsSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5343.
If sinA=32, 0∘<A<90∘, then find the value of 2(cosecA+cotA).
यदि sinA=32, 0∘<A<90∘ है, तो 2(cosecA+cotA) का मान ज्ञात कीजिए।
  1. A23
  2. B3
  3. C23
  4. D13
Show answer

Concept: sinA=32⇒A=60∘; use standard values.

  1. cosec60∘=23, cot60∘=13
  2. Sum =33=3
  3. 2(cosecA+cotA)=23

Yaad rakhein: cosecA+cotA=cotA2; cot30∘=3.

Answer: (A) 23

अवधारणा: sinA=32⇒A=60∘; मानक मान लगाएँ।

  1. cosec60∘=23, cot60∘=13
  2. योग =33=3
  3. 2(cosecA+cotA)=23

याद रखें: cosecA+cotA=cotA2; cot30∘=3।

उत्तर: (A) 23

SSC CPO Paper IQuantitative AptitudeTrigonometry – Standard AnglesSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5344.
The height and the radius of the base of a right circular cone are in the ratio of 12 : 5. If its volume is 314 cm3, then what is the slant height of the cone? (Use π = 3.14)
एक लंब वृत्तीय शंकु की ऊँचाई और आधार की त्रिज्या 12 : 5 के अनुपात में हैं। यदि इसका आयतन 314 cm3 है, तो शंकु की तिर्यक ऊँचाई कितनी है? (π = 3.14 का प्रयोग कीजिए)
  1. A12 cm
  2. B11 cm
  3. C13 cm
  4. D14 cm
Show answer

Concept: V=13πr2h, l=h2+r2.

  1. Let h=12k, r=5k
  2. 13×3.14×25k2×12k=314k3=314⇒k=1
  3. l=144+25=13cm

Trick: 5,12,13 triplet: l=13k.

Answer: (C) 13 cm

अवधारणा: V=13πr2h, l=h2+r2।

  1. माना h=12k, r=5k
  2. 13×3.14×25k2×12k=314k3=314⇒k=1
  3. l=144+25=13cm

ट्रिक: 5,12,13 त्रिक: l=13k।

उत्तर: (C) 13 cm

SSC CPO Paper IQuantitative AptitudeMensuration – ConeSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5345.
Three numbers are in the ratio of 5 : 7 : 9 and their LCM is 34,650. Their HCF is:
तीन संख्याएँ 5 : 7 : 9 के अनुपात में हैं और उनका LCM 34,650 है। उनका HCF है:
  1. A315
  2. B55
  3. C110
  4. D99
Show answer

Concept: Numbers 5h,7h,9h (5, 7, 9 are pairwise co-prime) ⇒ LCM =5×7×9×h=315h.

  1. 315h=34650
  2. h=34650315=110

Trick: HCF is the common multiplier h when the ratio terms are co-prime.

Answer: (C) 110

अवधारणा: संख्याएँ 5h,7h,9h (5, 7, 9 परस्पर सह-अभाज्य) ⇒ LCM =5×7×9×h=315h।

  1. 315h=34650
  2. h=34650315=110

ट्रिक: अनुपात के पद सह-अभाज्य हों तो HCF उभयनिष्ठ गुणक h होता है।

उत्तर: (C) 110

SSC CPO Paper IQuantitative AptitudeHCF & LCM – RatioSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5346.
Which is the largest number that divides each of 1036, 1813 and 3885 without leaving any remainder?
वह सबसे बड़ी संख्या कौन-सी है जो 1036, 1813 और 3885 में से प्रत्येक को बिना कोई शेषफल छोड़े विभाजित करती है?
  1. A333
  2. B111
  3. C259
  4. D37
Show answer

Concept: The largest number dividing all exactly = HCF.

  1. 1036=22×7×37
  2. 1813=72×37
  3. 3885=3×5×7×37
  4. HCF =7×37=259

Trick: Check options from the largest: 333 fails (1036÷333 not exact); 259 divides all.

Answer: (C) 259

अवधारणा: सभी को पूर्णतः विभाजित करने वाली सबसे बड़ी संख्या = HCF।

  1. 1036=22×7×37
  2. 1813=72×37
  3. 3885=3×5×7×37
  4. HCF =7×37=259

ट्रिक: सबसे बड़े विकल्प से जाँचें: 333 नहीं (1036÷333 पूर्ण नहीं); 259 सबको विभाजित करता है।

उत्तर: (C) 259

SSC CPO Paper IQuantitative AptitudeHCFSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5347.
If sinA=23, then find the value of (7−tanA)(3+cosA).
यदि sinA=23 है, तो (7−tanA)(3+cosA) का मान ज्ञात कीजिए।
  1. A613+1735
  2. B6135+173
  3. C613+175
  4. D613−1735
Show answer

Concept: From sinA=23: adjacent side =9−4=5, so cosA=53, tanA=25.

  1. (7−25)(3+53)=21+753−65−23
  2. 21−23=613
  3. 753−65=35−1835=1735
  4. Value =613+1735

Trick: Write 753=3535 to combine the surd terms.

Answer: (A) 613+1735

अवधारणा: sinA=23 से: आधार =9−4=5, अतः cosA=53, tanA=25।

  1. (7−25)(3+53)=21+753−65−23
  2. 21−23=613
  3. 753−65=35−1835=1735
  4. मान =613+1735

ट्रिक: 753=3535 लिखकर करणी पद जोड़ें।

उत्तर: (A) 613+1735

SSC CPO Paper IQuantitative AptitudeTrigonometry – RatiosSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5348.
In an election between two candidates, 20% of the voters on the voters list did not cast their votes and 80 voters cast their ballot papers blank. The winner secured 45% of all the voters in the list and he got 280 votes more than his rival. The number of voters on the list was:
दो उम्मीदवारों के बीच एक चुनाव में, मतदाता सूची के 20% मतदाताओं ने अपना मत नहीं डाला और 80 मतदाताओं ने अपने मतपत्र खाली डाले। विजेता ने सूची के सभी मतदाताओं के 45% मत प्राप्त किए और उसे अपने प्रतिद्वंद्वी से 280 मत अधिक मिले। सूची में मतदाताओं की संख्या कितनी थी?
  1. A1500
  2. B2800
  3. C2500
  4. D2000
Show answer

Concept: Valid votes = votes cast − blank votes = winner + loser.

  1. Let voters =N; cast =0.8N; valid =0.8N−80
  2. Winner =0.45N, loser =0.45N−280
  3. 0.9N−280=0.8N−80⇒0.1N=200
  4. N=2000

Trick: Check: valid =1520, winner 900, loser 620, difference 280.

Answer: (D) 2000

अवधारणा: वैध मत = डाले गए मत − खाली मत = विजेता + पराजित।

  1. माना कुल मतदाता =N; डाले गए =0.8N; वैध =0.8N−80
  2. विजेता =0.45N, पराजित =0.45N−280
  3. 0.9N−280=0.8N−80⇒0.1N=200
  4. N=2000

ट्रिक: जाँच: वैध =1520, विजेता 900, पराजित 620, अंतर 280।

उत्तर: (D) 2000

SSC CPO Paper IQuantitative AptitudePercentage – ElectionsSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5349.
Find the LCM of 73 and 657.
73 और 657 का LCM ज्ञात कीजिए।
  1. A73
  2. B657
  3. C146
  4. D365
Show answer

Concept: If one number is a multiple of the other, their LCM is the larger number.

  1. 657=9×73
  2. So 657 is a multiple of 73
  3. LCM =657

Yaad rakhein: If a∣b, then LCM(a,b)=b and HCF(a,b)=a.

Answer: (B) 657

अवधारणा: यदि एक संख्या दूसरी का गुणज हो, तो LCM बड़ी संख्या होती है।

  1. 657=9×73
  2. अतः 657, 73 का गुणज है
  3. LCM =657

याद रखें: यदि a∣b, तो LCM(a,b)=b और HCF(a,b)=a।

उत्तर: (B) 657

SSC CPO Paper IQuantitative AptitudeLCMSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5350.
In a circle, chords AB and CD intersect internally at E. If CD = 18 cm, DE = 5cm, AE = 13 cm, then the length of BE is:
एक वृत्त में, जीवाएँ AB और CD आंतरिक रूप से E पर प्रतिच्छेदित करती हैं। यदि CD = 18 cm, DE = 5cm, AE = 13 cm है, तो BE की लंबाई है:
  1. A4 cm
  2. B7 cm
  3. C3 cm
  4. D5 cm
Show answer

Concept: Intersecting chords theorem: AE×EB=CE×ED.

  1. CE=CD−DE=18−5=13cm
  2. 13×BE=13×5
  3. BE=5cm

Trick: Here AE=CE=13, so BE=DE=5 directly.

Answer: (D) 5 cm

अवधारणा: प्रतिच्छेदी जीवा प्रमेय: AE×EB=CE×ED।

  1. CE=CD−DE=18−5=13cm
  2. 13×BE=13×5
  3. BE=5cm

ट्रिक: यहाँ AE=CE=13, अतः सीधे BE=DE=5।

उत्तर: (D) 5 cm

SSC CPO Paper IQuantitative AptitudeGeometry – Intersecting ChordsSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5351.
Select the most appropriate meaning of the given idiom.
Fit as a fiddle
  1. ATo be extremely excited and energetic
  2. BTo be in good health
  3. CSomething is perfect
  4. DA good and useful invention
Show answer

Concept: The idiom fit as a fiddle describes a person who is in excellent physical health.

  1. A fiddle (violin) that is well tuned is 'fit' – in perfect working order; a person 'fit as a fiddle' is healthy and in good shape.
  2. Example: Even at eighty, my grandfather is fit as a fiddle.
  3. (A) 'extremely excited' is a different idea; (C) and (D) do not describe a person's health.

Yaad rakhein: Fiddle = healthy body, not excitement.

Answer: (B) To be in good health

अवधारणा: Idiom fit as a fiddle का अर्थ है – पूरी तरह स्वस्थ होना।

  1. अच्छी तरह tune किया हुआ fiddle (वायलिन) बिल्कुल ठीक काम करता है; वैसे ही 'fit as a fiddle' व्यक्ति पूरी तरह स्वस्थ होता है।
  2. उदाहरण: Even at eighty, my grandfather is fit as a fiddle.
  3. (A) excitement की बात करता है, (C) और (D) स्वास्थ्य से जुड़े नहीं हैं।

याद रखें: Fit as a fiddle = तंदुरुस्त।

उत्तर: (B) To be in good health

SSC CPO Paper IEnglish ComprehensionIdiomsSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5352.
Select the most appropriate meaning of the underlined word.
She has become a familiar figure in the world of politics.
  1. AKnown
  2. BLegend
  3. CElevated
  4. DFancy
Show answer

Concept: Familiar means well known or easily recognised because of being seen often.

  1. 'A familiar figure in politics' = a person whom everyone in politics knows.
  2. Known carries exactly this meaning.
  3. Legend = a very famous person (too strong); elevated = raised; fancy = decorative.

Yaad rakhein: Familiar face = known face.

Answer: (A) Known

अवधारणा: Familiar का अर्थ है – जाना-पहचाना, परिचित।

  1. 'A familiar figure in politics' = राजनीति में सबका जाना-पहचाना व्यक्ति।
  2. Known का यही अर्थ है।
  3. Legend = महान/दिग्गज व्यक्ति (अर्थ बहुत ज़्यादा), elevated = ऊँचा उठाया हुआ, fancy = सजावटी।

याद रखें: Familiar = परिचित = Known.

उत्तर: (A) Known

SSC CPO Paper IEnglish ComprehensionSynonyms (contextual)SSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5353.
Select the most appropriate ANTONYM of the given word.
Authentic
  1. AGenuine
  2. BFake
  3. CBasic
  4. DDifferent
Show answer

Concept: Authentic means real, genuine, not copied.

  1. Its opposite is something false or not real – fake.
  2. Genuine is a synonym, not an antonym.
  3. Basic and different are unrelated in meaning.

Yaad rakhein: Authentic signature vs fake signature.

Answer: (B) Fake

अवधारणा: Authentic का अर्थ है – असली, वास्तविक।

  1. इसका विलोम है नकली – fake।
  2. Genuine समानार्थी है, विलोम नहीं।
  3. Basic (मूल) और different (भिन्न) का अर्थ से कोई संबंध नहीं।

याद रखें: Authentic = असली, Fake = नकली।

उत्तर: (B) Fake

SSC CPO Paper IEnglish ComprehensionAntonymsSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5354.
Select the most appropriate ANTONYM of the given word.
Inquisitive
  1. AInnocent
  2. BIndifferent
  3. CCurious
  4. DStudious
Show answer

Concept: Inquisitive means eager to know or learn; curious.

  1. The opposite of being eager to know is having no interest at all – indifferent.
  2. Curious is a synonym; studious (fond of study) is close in sense.
  3. Innocent (free from guilt) is unrelated.

Yaad rakhein: Inquisitive = curious; indifferent = not bothered.

Answer: (B) Indifferent

अवधारणा: Inquisitive का अर्थ है – जिज्ञासु, जानने को उत्सुक।

  1. जानने की उत्सुकता का उल्टा है – बिल्कुल रुचि न होना, यानी indifferent (उदासीन)।
  2. Curious समानार्थी है; studious (पढ़ाकू) भी मिलता-जुलता है।
  3. Innocent (निर्दोष) असंबंधित है।

याद रखें: Inquisitive = जिज्ञासु, Indifferent = उदासीन।

उत्तर: (B) Indifferent

SSC CPO Paper IEnglish ComprehensionAntonymsSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5355.
Select the INCORRECTLY spelt word from the underlined words in the following
sentence.
It is important to see school holistically, it is not a set of atomic items of rooms, library, assembly halls, canteen and playgrounds; it is all of these but in symbiotic
relationship with each other, the contors of which are often far too obvious and often simply mysterious.
  1. Amysterious
  2. Bsymbiotic
  3. Ccontors
  4. Dholistically
Show answer

Concept: Check each underlined word against its standard spelling.

  1. holistically, symbiotic and mysterious are correctly spelt.
  2. contors is wrong; the correct word is contours (outlines/shape of something).
  3. So the incorrectly spelt word is 'contors'.

Yaad rakhein: Contour = con + TOUR (the 'u' is needed).

Answer: (C) contors

अवधारणा: हर underlined शब्द की सही वर्तनी जाँचें।

  1. holistically, symbiotic और mysterious सही लिखे हैं।
  2. contors गलत है; सही शब्द है contours (रूपरेखा/आकृति)।
  3. अतः गलत वर्तनी वाला शब्द 'contors' है।

याद रखें: Contour में 'tour' छिपा है – u ज़रूरी है।

उत्तर: (C) contors

SSC CPO Paper IEnglish ComprehensionSpellingSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5356.
The following sentence has been split into four segments. Identify the segment that contains an error.
Will Ramya / had completed / that work / by 2025?
  1. Aby 2025
  2. Bthat work
  3. Chad completed
  4. DWill Ramya
Show answer

Concept: An action that will be finished before a stated future time (by 2025) takes the future perfect: will + have + V3.

  1. The question begins with Will, so the verb must be have completed, not had completed.
  2. Had + V3 is past perfect and cannot follow will.
  3. Correct: Will Ramya have completed that work by 2025?

Yaad rakhein: By + future time → will have + V3.

Answer: (C) had completed

अवधारणा: भविष्य के किसी समय (by 2025) से पहले पूरा होने वाले कार्य के लिए future perfect: will + have + V3।

  1. वाक्य Will से शुरू है, इसलिए had completed नहीं, have completed आएगा।
  2. Had + V3 past perfect है, यह will के बाद नहीं आता।
  3. सही: Will Ramya have completed that work by 2025?

याद रखें: By + भविष्य का समय → will have + V3.

उत्तर: (C) had completed

SSC CPO Paper IEnglish ComprehensionTenses – future perfectSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5357.
Select the most appropriate meaning of the given idiom.
Apple of discord
  1. APractical
  2. BDistant love
  3. CBone of contention
  4. DCentre of attraction
Show answer

Concept: Apple of discord means the cause of a quarrel or dispute.

  1. It comes from the Greek myth of the golden apple that started a quarrel among goddesses (and led to the Trojan War).
  2. Bone of contention has the same meaning – a subject of dispute.
  3. (D) 'centre of attraction' is the trap; that is closer to apple of one's eye (a dearly loved person).

Yaad rakhein: Apple of DISCORD = cause of discord (quarrel).

Answer: (C) Bone of contention

अवधारणा: Apple of discord का अर्थ है – झगड़े की जड़।

  1. यह यूनानी कथा के सोने के सेब से आया है जिसने देवियों में झगड़ा कराया।
  2. Bone of contention का भी यही अर्थ है – विवाद का विषय।
  3. (D) 'centre of attraction' भ्रम पैदा करता है; वह apple of one's eye (अत्यंत प्रिय) से मिलता है।

याद रखें: Discord = झगड़ा, इसलिए apple of discord = झगड़े की जड़।

उत्तर: (C) Bone of contention

SSC CPO Paper IEnglish ComprehensionIdiomsSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5358.
Fill in the blank by selecting the meaningful and correctly spelt word from the given options.
They knew that the stock of the food was getting reduced and the fund________for that was not enough for the next week.
  1. Aasserted
  2. Ballotted
  3. Calerted
  4. Dabandoned
Show answer

Concept: Funds are allotted (assigned/set aside) for a purpose.

  1. The sentence says the money set aside for food was not enough – 'the fund allotted for that'.
  2. Asserted = stated firmly; alerted = warned; abandoned = left behind – none fits 'fund'.
  3. Spelling: allotted (double t).

Yaad rakhein: Fund/time/seats are 'allotted'.

Answer: (B) allotted

अवधारणा: किसी काम के लिए धन allotted (आवंटित) किया जाता है।

  1. वाक्य कहता है कि भोजन के लिए रखा गया fund अगले सप्ताह के लिए पर्याप्त नहीं था – 'the fund allotted for that'।
  2. Asserted = ज़ोर देकर कहा, alerted = सचेत किया, abandoned = छोड़ दिया – fund के साथ अर्थहीन।
  3. वर्तनी: allotted (दो t)।

याद रखें: Fund, समय, सीटें – सब 'allotted' होते हैं।

उत्तर: (B) allotted

SSC CPO Paper IEnglish ComprehensionFill in the blank (vocabulary)SSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5359.
Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’ The unexpected turn beside the project put the company in a big financial crisis.
  1. Ain the project
  2. Buntil the project
  3. CNo substitution required
  4. Dbetween the project
Show answer

Concept: An unexpected development happens in a project (within it).

  1. 'A turn in the project' = a change within the project, which caused the crisis.
  2. Beside = next to (physical position) – wrong here.
  3. Until shows time and between needs two things.

Yaad rakhein: Turn in the case / in the story / in the project.

Answer: (A) in the project

अवधारणा: किसी project के भीतर आया अप्रत्याशित बदलाव – in the project।

  1. 'A turn in the project' = project में आया बदलाव, जिससे संकट आया।
  2. Beside = बगल में (स्थान) – यहाँ गलत।
  3. Until समय बताता है, between के लिए दो चीज़ें चाहिए।

याद रखें: Turn in the story/project – 'in' लगता है।

उत्तर: (A) in the project

SSC CPO Paper IEnglish ComprehensionPrepositionsSSC CPO Paper I 2023 · 5 Oct Shift 1 →
Q5360.
Select the most appropriate option that can substitute the underlined segment in the given sentence.
We all should respect each other.
  1. Aevery other
  2. Ball other
  3. Cone another
  4. Dall of us
Show answer

Concept: Traditional rule: each other is used for two persons, one another for more than two.

  1. The subject is We all – more than two people.
  2. So the reciprocal pronoun should be one another.
  3. Every other, all other, all of us are not reciprocal pronouns.

Yaad rakhein: Two → each other; many → one another.

Answer: (C) one another

अवधारणा: पारंपरिक नियम: दो व्यक्तियों के लिए each other, दो से अधिक के लिए one another।

  1. Subject We all है – दो से अधिक लोग।
  2. इसलिए one another आएगा।
  3. Every other, all other, all of us पारस्परिक सर्वनाम नहीं हैं।

याद रखें: दो → each other; अनेक → one another.

उत्तर: (C) one another

SSC CPO Paper IEnglish ComprehensionReciprocal pronounsSSC CPO Paper I 2023 · 5 Oct Shift 1 →