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The sum underset(k=1)overset(20)sum k (1...

The sum `underset(k=1)overset(20)sum k (1)/(2^(k))` is equal to

A

`2-11/2^19`

B

`1-11/2^20`

C

`2-3/2^17`

D

`2-21/2^20`

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The correct Answer is:
A
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