Practice problem
If there are nnn pigeons and n+1n+1n+1 holes, then...
There is a hole with at least 2 pigeons in it.
There is a pigeon with at least 2 holes in it.
There is at least 1 empty hole.
There are 2n+12n+12n+1 pigeonholes.
Type a concept, like “slope” or “photosynthesis”.