- A26
- B27
- C28
- D25
Show answer
Concept: Find a rule using both given examples, then apply it.
- 5$3: 5×3 = 15, 5+3 = 8, 15 + 8 = 23 ✓.
- 5$4: 20 + 9 = 29 ✓ → rule a$b = ab + a + b.
- 6$3 = 18 + 9 = 27.
Trick: ab + a + b = (a+1)(b+1) − 1: (7×4) − 1 = 27.
Answer: (B) 27
अवधारणा: दोनों उदाहरणों से एक नियम निकालकर लागू करें।
हल:
- 5$3: 5×3 = 15, 5+3 = 8, 15 + 8 = 23 ✓।
- 5$4: 20 + 9 = 29 ✓ → नियम a$b = ab + a + b।
- 6$3 = 18 + 9 = 27।
ट्रिक: ab + a + b = (a+1)(b+1) − 1: (7×4) − 1 = 27।
उत्तर: (B) 27
