Which number will replace the question mark (?) in the following series?
1, 5, ?, 25, 41, 61
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 13.
Given series: 1, 5, ?, 25, 41, 61
The series follows this pattern:
1 + 4 = 5
5 + 8 = 13
13 + 12 = 25
25 + 16 = 41
41 + 20 = 61
So, the missing term in the series is 13.