looking for combinatorial identity
42763
How to prove Vandermonde's Identity: $\sum_{k=0}^{n}\binom{R}{k}\binom{M}{n-k}=\binom{R+M}{n}$?
107964
Simple combinatorics problem.
71564
Combinatorial proof of identity involving central binomial coefficients
103504
Weird $3^n$ in an identity to be combinatorially proved
41205
Help me solve a combinatorial problem
42062
Interpretation of a combinatorial expression
4610
Proving an identity with a combinatorial proof: $\binom{n}{k}\binom{k}{r}=\binom{n}{r}\binom{n-r}{k-r}$
146810
How to derive this binomial identity?
46132
Combinatorial interpretation for the identity $\sum\limits_i\binom{m}{i}\binom{n}{j-i}=\binom{m+n}{j}$?
60416
Finding a permutation, and number of, from powers of the permutation
117775
Combinatorial proof of a Stirling number identity.
158508
Combinatorial Proof for Binomial Identity: $\sum_{k = 0}^n \binom{k}{p} = \binom{n+1}{p+1}$
75910
Combinatorial Proof of Combinatorial Identity involving $(-1)^k \binom {n-1}{k}$
29974
is there a way to generate identity or sequence that increments in power of 2?
122006
Proving combinatorial identity $\sum_{k=0}^{n}(-1)^k \binom{2n-k}k 2^{2n-2k} = 2n+1$ "directly"
25283
Intermediate Text in Combinatorics?
22948
Is this binomial coefficient identity known?