Math Contest: find value of 1^2-2^2+3^2-4^2+...-(2006)^2+(20

jessieputono said:

Okay I had a math contest today...and I just wanted to check if I got the answers correct for this question...
Find the value of s
s=1^2-2^2+3^2-4^2+...-(2006)^2+(2007)^2
I got 2015028

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