Which number will replace the question mark (?) in the following series?
77, 76, 80, 71, 87, ?, 98
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4, i.e., 62.
77 - 1 = 76, 76 + 4 = 80, 80 - 9 = 71, 71 + 16 = 87, 87 - 25 = 62, 62 + 36 = 98