Select the number that can replace the question mark (?) in the following series.
5, 10, 26, ?, 122, 170
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 50
Explanation:
(2)2 + 1 = 4 + 1 = 5
(3)2 + 1 = 9 + 1 = 10
(5)2 + 1 = 25 + 1 = 26
(7)2 + 1 = 49 + 1 = 50
(11)2 + 1 = 121 + 1 = 122
(13)2 + 1 = 169 + 1 = 170