The night before the exam, sleep. A rested mind recalls what a tired one has only read.

SOF IMO · Paper Folding and Cutting · Quiz

Paper Folding and Cutting — quick quiz

4 SOF IMO-pattern questions on Paper Folding and Cutting. Instant scoring and solutions, no signup — see where you stand in a few minutes.

Question 1 of 4

Hard

A square piece of paper is folded twice and then a circular hole is punched through all layers. When the paper is completely unfolded, how many holes will appear?