Making 11p

How many ways are there to make 11p using 1p, 2p and 5p coins?
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Problem



5p, 2p and 1p coins (or a mixture of any or all of these) are used to make a total of 11p. In how many different ways can this be done?

 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.