Combinatorial express of n^3
6803
Expression for power of a natural number in terms of binomial coefficients
125174
Combinatorial intuition of identity
126885
canonical representation of three skew lines in $\mathbb{P}^3$
129163
Showing that every positive integer can be represented in this form
129304
Alternative combinatorial proof for $\sum\limits_{r=0}^n\binom{n}{r}\binom{m+r}{n}=\sum\limits_{r=0}^n\binom{n}{r}\binom{m}{r}2^r$
142978
combinatorics: sum of product of integer compositions
50615
Expressing a Non Negative Integer as Sums of Two Squares
122504
Factorisations of permutations
103347
combinatorial proof of summation
62175
A general formula for $n$ distinguishable arrangements of length $\ell$ of a sequence of a given size?
156383
Proving a combinatorial identity without double counting
21000
Calculating $\sum_{k=1}^nk(k!)$ combinatorially
61483
Prove the following identity combinatorially
75349
Minimal polynomial of $\sqrt[3]{2} + \sqrt{3}$
96585
Sums and permutation
39642
Efficient way to find $[\mathbb{Q}(\sqrt{5}, \sqrt{3}, \sqrt{2}): \mathbb{Q}(\sqrt{3}, \sqrt{2})]$
70327
the numer of partial function between two sets in combinatoric way