Select the number from among the given options that can replace the question mark (?) in the following series.
39, 78, 117, 156, ?, 234
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 195.
The logic in the series is -
39 + 39 = 78, 78 + 39 = 117, 117 + 39 = 156, 156 + 39 = 195, 195 + 39 = 234