Sorry, I can not express it any better. Look at the example please. The answer, 50 is correct. I think 'How many ways' is good. Just search for any combination of 100, 50, 20 , 10 and 5 euro notes where the sum is 100 without repeating a combination. I hope it is clearer to you now.
Boris

In reply to Re^4: How to generate restricted partitions of an integer by borisz
in thread How to generate restricted partitions of an integer by borisz

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