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IngridMossfb9997 ∙
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Sum = 79*(79+1)/2 = 79*80/2 = 3160
The sum of the numbers given is 31. 1 + 2 + 4 + 8 + ... + 2n = 2n+1 - 1
The sum of -1 and -1 is -2.
5050
The sum of -1 and -2 is -3.