If you add 5 + 5 + 5 you get 15. This is the minimum value you can use so there can be no solution. Or the question is faulty.
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There are an infinite number of sets of 3 numbers which total 13. 13, 1, -1 12, 2, -1 14, 1, -2 100, -50, -37 12, .3, .7 1, 5, 7 2, 6, 5 etc...
3 + 5 + 5
The next number is 13, the total of the two numbers preceding it.
8 and 5 8-5 = 3 8+5 = 13
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