Problem #PRU-65387

Problems Methods Colouring Chessboard colouring Examples and counterexamples. Constructive proofs Pigeonhole principle Pigeonhole principle (finite number of poits, lines etc.)

13–16 3.0

Problem

What is the minimum number of $1 \times 1$ squares that need to be drawn in order to get an image of a $25 \times 25$ square divided into 625 smaller 1x1 squares?

To see the solution register and get verified.