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The sum of the first 20 terms of the ser...

The sum of the first 20 terms of the series `1+(3)/(2)+(7)/(4)+(15)/(8)+(31)/(16)+…`, is

A

`38+(1)/(2^(19))`

B

`38+(1)/(2^(29))`

C

`39+(1)/(2^(20))`

D

`39+(1)/(2^(19))`

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The correct Answer is:
A
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