Which of the following numbers will replace the question mark (?) in the given series?
19, 21, 25, 33, ?, 81, 145
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 49.
19 + 2 = 21; 21 + 4 = 25; 25 + 8 = 33; 33 + 16 = 49; 49 + 32 = 81; 81 + 64 = 145