The coefficient of x^15 in the product ...

The coefficient of `x^15` in the product `(1-x)(1-2x) (1-2^2 x) (1-2^3 x)` …. `(1-2^15 x)` is :

A

`2^105 - 2^121`

B

`2^121 - 2^105`

C

`2^104 - 2^120`

D

`2^108 -2^110`

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The correct Answer is:

A

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