Find the next number in the series: 3, 7, 15, 31, 63, ?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 127.
Given series: 3, 7, 15, 31, 63, ?
3 × 2 + 1 = 7
7 × 2 + 1 = 15
15 × 2 + 1 = 31
31 × 2 + 1 = 63
63 × 2 + 1 = 127