What should come in place of the question mark '?' in the following number series?
2, 3, 6, 15, ?, 157.5
Show answer & explanation
Correct answer: B
Explanation
2 × 1.5 = 3
3 × 2 = 6
6 × 2.5 = 15
15 × 3 = 45
45 × 3.5 = 157.5
That is, the factors are 1.5, 2, 2.5, 3, 3.5, respectively.
Therefore,
15 × 3 = 45
Correct answer: 45