9 is related to 90 following a certain logic. Following the same logic, 12 is related to 156. Which of the following numbers is related to 72 using the same logic?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 8.
9 is related to 90 → 9 × (9 + 1) = 9 × 10 = 90
12 is related to 156 → 12 × (12 + 1) = 12 × 13 = 156
Similarly, ? is related to 72 → 8 × (8 + 1) = 8 × 9 = 72