What will come in the place of the question (?) mark in the following number series? 4620, 420, 60, ?, 4, 2

Question

What will come in the place of the question (?) mark in the following number series?

4620, 420, 60, ?, 4, 2

A. 48

B. 12

C. 30

D. 25

Answer: B

Solution:

The Prime no is 2, 3, 5, 7, 11,…

420 * 11 = 4620

60 * 7 = 420

x * 5 = 60 <=> x = 12

4 * 3 = 12

2 * 2 = 4

so, the answer is X = 12.