Sum of combinations with varying $n$
36786
Prove $\sum\limits_{i=0}^n\binom{i+k-1}{k-1}=\binom{n+k}{k}$ (a.k.a. Hockey-Stick Identity)
17551
Truncated alternating binomial sum
103347
combinatorial proof of summation
81124
Infinite product problem: $\sum p_n0$
104704
Evaluate $\sum\limits_{k=0}^n \binom{n}{k}$ combinatorially
25338
Sum of $n$ integers from set of size $2n-1$ divides $n$
109599
A finite sum involving the binomial coefficients and the harmonic numbers
122024
Asymptotic of a sum involving binomial coefficients
94060
Sum of square binomial coefficients
121279
Proving an Combination formula $ \binom{n}{k} = \binom{n-1}{k}+\binom{n-1}{k-1}$
87664
Combination of $n$ letter out of $3n$.
84739
Amount of Number Combinations to Reach a Sum of 10 With Integers 1-9 Using 2 or More Integers
32260
Alternating Sum of Cubes
149010
Finding Combinations to the provided Sum value
70041
Sum with parameter convergence
137973
What is the formula for Combination with repetition?
93617
Sum of the product of two combinations