Answer:
Explanation:
I must assume that you meant, "the sum of which four numbers equals 15?"
15 = 6 + 9
= 3 + 3 + 9
= 3 + 3 + 3 + 6
All of these sets (on the right side) add up to 15. There are four numbers in the last set.
1,3,5,15
these are the factors of 15
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