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Consider expansion of (1+x)^(200)=a(0)+a...

Consider expansion of `(1+x)^(200)=a_(0)+a_(1)x+a_(2)x^(2)+………+a_(200)x^(200)` Value of `a_(0)a_(1)+a_(1)a_(2)+a_(2)a_(3)+…………+a_(199)a_(200)` is

A

`.^(200)C_(197)`

B

`.^(200)C_(10)`

C

`.^(400)C_(199)`

D

`.^(400)C_(200)`

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