# Puzzles

## One two three

Source: Futility Closet

Each point on a straight line is either red or blue. Show that it's always possible to find three points of the same color in which one is the midpoint of the other two.

If you enjoyed this puzzle, check out Sunday Afternoon Maths XLIII,

puzzles about colouring, or a random puzzle.

puzzles about colouring, or a random puzzle.