Number of ways to choose at least 0 elements from n
92784
Intuitive (combinatorial) proof of $2^n=\sum_{k=0}^n {n\choose k}$
57221
counting the number of elements in a conjugacy class of $S_n$
62371
Expected number of times a set of 10 integers (selected from 1-100) is selected before all 100 are seen
98313
Number of possible permutations of n1 1's, n2 2's, n3 3's, n4 4's such that no two adjacent elements are same?
153072
Guessing a subset of $\{1,...,N\}$
45448
Minimum number of $k$-partitions of a set of size $n$ to enumerate all $n \choose k$ combinations
111324
Finding number of relations on a set with 3 elements
108971
Finding the limit of $\sqrt[n]{{kn \choose n}}$
41365
Choice function for collection of arbitrary finite sets. AC required?
96086
Double Factorial: Number of possibilities to partition a set of $2n$ items into $n$ pairs
33660
Efficiently selecting a set of random elements from a linked list
147766
Sum of Permutations from 0 to n
30575
How to precalculate valid number of combinations instead of using while loop?
81217
Fastest way to find out minimum of 3 numbers?
37051
Choosing numbers without consecutive numbers.
58103
number of permutations in which no two consecutive numbers are adjacent
115236
Calculate the sum of inverse values of ${n\choose 0}, {n\choose 1}, ... {n\choose n}$