Can anybody please tell me the summation formula for:
$$\sum_{i=1}^NC(k+i-1, i) = ?$$
Where ' k ' is some constant.
Here C(x, y) stands for Combinatorics formula e.g. C(12, 6) = 924.
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Do you mean the binominal $\dbinom{k+i-1}{i}$? – Matthias Apr 07 '15 at 09:48
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See $\sum_{i=0}^n\binom{i+k-1}{k-1}=\binom{n+k}{k}$ – Bart Michels Apr 08 '15 at 15:07