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The coefficient of x^(301 in the expansi...

The coefficient of `x^(301` in the expansion of `(1+x)^(500)+x(1+x)^(499)+x^(2)(1+x)^(498)+…+x^(500)` is

A

`"^(500)C_(301)`

B

`"^(501)C_(200)`

C

`"^(500)C_(300)`

D

`"^(501)C_(302)`

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