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If C(n+1,3)=4C(n,2) then n=...

If `C(n+1,3)=4C(n,2)` then `n=`

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If C_(0),C_(1), C_(2),...,C_(N) denote the binomial coefficients in the expansion of (1 + x)^(n) , then 1^(3). C_(1)-2^(3). C_(3) - 4^(3) . C_(4) + ...+ (-1)^(n-1)n^(3) C_(n)=