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New posts in Pigeonhole Principle
Pigeonhole Principle - Show two subsets have the same age
May 04, 2021
Problem concerning the use of Pigeonhole (Box) principle
May 04, 2021
Pigeonhole principle with cartesian product
May 03, 2021
Pigeonhole Principle - Roulette Wheel
May 03, 2021
Perfect square product among 17 integers
May 03, 2021
Prove that any set of $3n+1$ numbers taken from $\{1,2,...,4n\}$ contains three different numbers $a$, $b$, $c$ such that $a|b$ and $b|c$.
May 03, 2021
A Pigeonhole-Principle from IMO Shortlist.
May 03, 2021
How to use generalized pigeonhole principle to be sure that at least one of the integers picked is even?
May 03, 2021
Let $T$ be any subset of $\{1,2,3,...,100\}$ with $69$ elements. Prove that one can find four distinct integers such that $a+b+c=d$.
May 03, 2021
Prove that if fifteen bishops were placed on a chessboard, then at least two of them attack each other.
May 03, 2021
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