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The coefficient of x^49 in the expansio...

The coefficient of `x^49` in the expansion of `(x-1)(x-1/2)(x-1/2^2)........(x+1/2^49)` is equal to

A

`-2(1- 1/(2)^50 )`

B

`+ "ve coefficient of" x`

C

`-"ve coefficient of" x `

D

`-2(1-1/(2)^(49))`

Text Solution

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The correct Answer is:
A
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