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sum(x-1)^(20) k(1)/(2^(k)) is equal to...

`sum_(x-1)^(20) k(1)/(2^(k))` is equal to

A

`2-(11)/(2^(19))`

B

`1-(11)/(2^(20))`

C

`2+(11)/(2^(19))`

D

`1+(11)/(2^(20))`

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The correct Answer is:
A
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