Problem 27 : Exact Change Only

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One day, while making a cup of tea, I realise I’m out of milk. I shove a handful of coins in my pocket and hurry to the local corner shop.

The milk costs £2, but as I count out the money I realise I can’t make exactly £2.

1. What is the maximum amount of money I could have brought with me?

2. How many different combinations of coins give the answer to part 1?

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