In the following number series a wrong number is given Find out the wrong number 20 22 28 42 70 134 ...........

Quantitative Aptitude(IBPS CL) Number series

In the following number series, a wrong number is given. Find out the wrong number.

20, 22, 28, 42, 70, 134

This questions was previously asked in

IBPS Clerk Prelims

134

Correct option:2

Solution:

Given series 20, 22, 28, 42, 70, 134

There is logic of double difference

The number double at 2nd level i.e. 4,8,16 so at first level it should be 2,6,14,30,62

So 70 is the number which is not follwing the pattern.In place of 70 there should be 72.

Hence correct anwer is 70

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