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A number series is given below with one ...

A number series is given below with one number missing, shown by a ''?''. Choose from the options the correct alternative that will fit the pattern of the series
4,9, 19, ?, 79, 159

A

10

B

8

C

12

D

9

Text Solution

Verified by Experts

The correct Answer is:
D
`4xx 2 + 1 = 9`
`9xx2 + 1 = 19`
`19 xx 2 + 1 = 39`
`39 xx 2 + 1 = 79`
`79 xx 2 + 1 = 159`
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