Question discussion

In how many distinct ways (order of coins ignored) can a sum of 11 be made using unlimited coins of denominations 1, 5, 6 and 9?

Correct answer: A

Explanation

The combinations are 9+1+1, 6+5, 6+1×5, 5+5+1, 5+1×6 and 1×11, which makes 6 ways.

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