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Making 11p

Stage: 3 Short Challenge Level: Challenge Level:1

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.