Does not belong

Question:

Which number does not belong to this series 1,1,2,3,4,5,8,13,21?

.

.

C

A

P

T

A

I

N

I

N

T

E

R

V

I

E

W

.

.

Answer: 4. Let see how

This question is based on adding the adjacent number in the series.

1+1=2

1+2=3

2+3=5, there you go

3+5=8

5+8= 13

8+13=21 and so on

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