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.