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If C(0), C(1), C(2), ..., C(n) denote th...

If `C_(0), C_(1), C_(2), ..., C_(n)` denote the binomial
cefficients in the expansion of `(1 + x )^(n)` , then
` a C_(0) + (a + b) C_(1) + (a + 2b) C_(2) + ...+ (a + nb)C_(n) = `.

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