Sum of weighted binomial coefficients
44111
Find the value of $\sum_{k=1}^{n}k\binom{n}{k}$?
90904
Combinatorial proof of an identity with squared binomial coefficients
52557
Derivation of binomial coefficient in binomial theorem.
131468
Summation of Central Binomial Coefficients divided by even powers of $2$
150355
Finding sum of binomial series
15666
explanation for a combinatorial identity involving the binomial coefficient
140607
Squared binomial coefficient
142303
Alternating sum of binomial coefficients multiplied by (1/k+1)
74294
How to simplify $\sum_{i=1}^{k}\binom{n + i - 1}{i}$?
31970
Alternating sum of squares of binomial coefficients
122024
Asymptotic of a sum involving binomial coefficients
143945
Summation of combination of binomial coefficient
75723
Odd Binomial Coefficients?
43066
Finding value of $S-T$ in $2$ binomial sum.
57986
Sum of products of combinatorials
439
Alternating binomial sum with intervals of two
103840
Calculate $\sum_{k=1}^n k2^{n-k}$