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Not counting negative numbers (which would give you an infinite number of ways of adding numbers together to equal 10), there are 6 different ways (permutations) of adding numbers together to equal 10.

0 + 10

1 + 9

2 + 8

3 + 7

4 + 6

5 + 5

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Q: How many way can you add 2 numbers to equal 10?
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