weather you would count '0' or not, i dont know but em... 1,2,3,4,5 or 0,1,2,3,4
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Assuming the first five numbers is meant to refer, not to the first five real numbers but to the first five positive integers, the answer is 1*2*3*4*5 = 120
5
1,2,3,4,5
five pairs
Five of them.