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  maneljoyce  

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by maneljoyce
6-24-12
boss, can you please help me find the sum of all integers from -10 to 2012 inclusive
The sum is 2,025,023
How did you get it?
-10+(-1) = 11 then divide 10 by 2, the answer is 5. -11x5 = -55. 2012+1 = 2013. 2012 divided by 2 is 1006. Multiply 2013 by 1006 the answer is 2,025,078. The last step is subtract 55 from 2,025,078
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