Question

Complete the given series :
1 2 2 3 6 5 24 8 120 __
The answer is 12 but how ?
The options were : A) 12 B) 15 C) 35 D) 60.

Answer 1

2+1=3

3+2=5

5+3=8

8+4=12

Answer 2

When you see the ! symbol after a number, that means it’s a factorial:

6! means “six factorial.”

3! means “3 factorial.”

It’s a shorthand way of writing numbers. For example, instead of writing 479001600, you could write 12! instead.