Which number will replace the question mark (?) in the following series?
6, 20, 42, ?, 110, 156
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 72.
Given Series: 6, 20, 42, ?, 110, 156
Logic: Odd number multiplied by its previous number
3 × 2 = 6; 5 × 4 = 20; 7 × 6 = 42; 9 × 8 = 72; 11 × 10 = 110; 13 × 12 = 156