Which of the following numbers will replace the question mark (?) in the given series?
8, 15, 26, ?, 56, 75
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 39.
8 + 7 = 15; 15 + 11 = 26; 26 + 13 = 39; 39 + 17 = 56; 56 + 19 = 75