Lower bounds for ${{2n} \choose {n}}$
88059
Elementary central binomial coefficient estimates
39504
Why does $ \frac{2x}{2+x}$ provide a particularly tight lower bound for $\ln(1+x)$ for small positive values of $x$?
35660
Elements of order 2 in $D_{2n}$
107010
How many elements of order $k$ are in $S_n$?
9411
Number of permutations of $n$ elements where no number $i$ is in position $i$
96086
Double Factorial: Number of possibilities to partition a set of $2n$ items into $n$ pairs
10724
Case of the 'mice problem' for $n=3$
20922
If all minors are $0$, the rank is at most $n-2$
139398
Distribution of $n\choose x$
117658
A set with n elements has 2^n subsets
108971
Finding the limit of $\sqrt[n]{{kn \choose n}}$
154038
A constructive lower bound on Ramsey numbers
136918
How to determine the smallest numbers with $n$ factors
424
Proving Pascal's Rule : ${{n} \choose {r}}={{n-1} \choose {r-1}}+{{n-1} \choose r}$ when $1\leq r\leq n$
144017
How to find the smallest $n$ such that $n^a\equiv 1 \pmod p$
77128
Necessary and Sufficient conditions for $(i \, j)$ and $(1 \, 2 \, \dotsc \, n)$ generate $S_n$.
24091
How many ways can $r$ nonconsecutive integers be chosen from the first $n$ integers?