Which of the following numbers will replace the question mark (?) in the given series?
15, ?, 27, 39, 55, 75
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 19.
15 + 4 = 19; 19 + 8 = 27; 27 + 12 = 39; 39 + 16 = 55; 55 + 20 = 75