Problem on binomial coefficients
87664
Combination of $n$ letter out of $3n$.
22948
Is this binomial coefficient identity known?
25673
Number after binomial coefficient
19581
$\sum_{k=0}^n (-1)^k \binom{n}{k}^2$ and $\sum_{k=0}^n k \binom{n}{k}^2$
44111
Find the value of $\sum_{k=1}^{n}k\binom{n}{k}$?
114277
Proving in Discrete Structures Problem that $2^N = \binom{N}{0} + \binom{N}{1} + \binom{N}{2} + \dots + \binom{N}{N}$
120074
Prove by Combinatorial Argument that $\binom{n}{k}= \frac{n}{k} \binom{n-1}{k-1}$
140607
Squared binomial coefficient
126214
Multiplying Binomial Terms
146533
Having problems proving $ \sum_{r=0}^{n}(r+1) \binom{n}{r} = (n+2)2^{n-1} $
148949
Find the value of $\sum_{k=1}^{n} k \binom {n} {k}$
57744
Strange behaviour of binomial coefficient's delimiters
66019
Revisited: Binomial Theorem: An Inductive Proof
132249
Sum of every $k$th binomial coefficient.
107335
Prove equality between binomial coefficients.
59638
How to prove this result on binomial coefficients?
75723
Odd Binomial Coefficients?