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The coefficient of x^(101) in the expre...

The coefficient of `x^(101)` in the expression `(5 + x)^(500) + x(5 + x)^(499) +x^2(5 + x)^(498) + .......+x^(500), xgt0`, is

A

`""_(501)C_(101)(5)^(399)`

B

`""_(501)C_(101)(5)^(400)`

C

`""_(501)C_(100)(5)^(400)`

D

`""_(500)C_(101)(5)^(399)`

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