Number of combinations formula
424
Proving Pascal's Rule : ${{n} \choose {r}}={{n-1} \choose {r-1}}+{{n-1} \choose r}$ when $1\leq r\leq n$
134599
How do I do Combinatorics / Counting?
108941
Combinatorics Question Asking How Many Integer Solutions Given Different Restrictions
60661
How to solve this combination problem quickly?
93617
Sum of the product of two combinations
30575
How to precalculate valid number of combinations instead of using while loop?
54674
combinations groups question
3451
All combinations of a list of lists
96585
Sums and permutation
36287
How to create all possible permutations?
149807
Get a list of combinations of lists' elements
149010
Finding Combinations to the provided Sum value
26343
Number of certain (0,1)-matrices, Stanley's Enumerative Combinatorics
137973
What is the formula for Combination with repetition?
14979
Making all possible combinations of a list
9411
Number of permutations of $n$ elements where no number $i$ is in position $i$
55840
Number of functions from n-element set to {1, 2, …, m}