New posts in pigeonhole-principle

The pigeonhole principle(?)

How many people would you need in a room to ensure with 100% probaility that three have the same birthday?

Show that given a set of positive n integers, there exists a non-empty subset whose sum is divisible by n

Does there exist a bijection that is not eventually equal to the identity, but has a finite number of "crosses"?

The Probabilistic Pigeon Hole Principle

Arc sums for a circle of $k$ positive integers whose total sum is $n$

Prove that the 23 people have the same weight.

Killing Flies with a Checkerboard Flyswatter

101 positive integers placed on a circle

To find the minimum number of $3$-toppings pizza so that it meets the demand of my friend!

Prove that there are two subsets of any cardinality-10 subsets of $\{1,2\dots,106\}$ that sum to the same number

Prove that at a party with at least two people, there are two people who know the same number of people...

"Math Lotto" Tickets - finding the minimum winning set

How are the pigeonholes calculated in this pigeon-hole problem?

Existance of multiple of $n$ with only 0 and 1 as it's digits [duplicate]

Prove that any set of 2015 numbers has a subset who's sum is divisible by 2015

pigeonhole principle divisibility proof

Difficult variation of the committee problem

Finding equal partial sum given two $N$-tuples of natural numbers

Is Pigeonhole Principle the negation of Dedekind-infinite?