Copyright © University of Cambridge. All rights reserved.

'Making 11p' printed from https://nrich.maths.org/

Show menu

11

With no 5p coins, there could be 0, 1, 2, 3, 4 or 5 2p coins, i.e. 6 possible ways.

With one 5p coin, there could be 0, 1, 2 or 3 2p coins, i.e. 4 possible ways.

With two 5p coins, there can be no 2p coins, i.e. 1 possible way.
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.