12
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The numbers are: 9 and -6
9
All you do is add all of the numbers 3 times and 1 an 9 4 times
How do you add 9, 5, 3, and 1 in such a way to get sum of 21 by using only 6 numbers?You would add 9+5+3+1+1+2 and your answer would be 21.
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