Which of the following numbers will replace the question mark (?) in the given series?
12, 25, 49, ?, 197, 395
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 99.
12 × 2 + 1 = 25
25 × 2 - 1 = 49
49 × 2 + 1 = 99
99 × 2 - 1 = 197
197 × 2 + 1 = 395