Select the number that can replace the question mark (?) in the following series.
17, 21, 30, 46, 71, ?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 107
17, 21, 30, 46, 71, ?
17 + (2)2 = 17 + 4 = 21
21 + (3)2 = 21 + 9 = 30
30 + (4)2 = 30 + 16 = 46
46 + (5)2 = 46 + 25 = 71
71 + (6)2 = 71 + 36 = 107