What will come at the place of question mark?
1, 3, 7, 15, 31, ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 63.
Given series: 1, 3, 7, 15, 31, ?
1 × 2 + 1 = 3, 3 × 2 + 1 = 7, 7 × 2 + 1 = 15, 15 × 2 + 1 = 31, 31 × 2 + 1 = 63