Select the number from among the given options that can replace the question mark (?) in the following series.
3, 2, 3, 8, 31, ?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 154.
3, 2, 3, 8, 31, ?
(3 × 1) - 1=2
(2 × 2) - 1= 3
(3 × 3) - 1=8
(8 × 4) - 1= 31
(31 × 5) - 1= 154