Which of the following numbers will replace the question mark (?) in the given series?
5, 13, 29, ?, 125, 253
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 61.
5 + 8 = 13; 13 + (8 × 2) = 29; 29 + (16 × 2) = 61; 61 + (32 × 2) = 125; 125 + (64 × 2) = 253