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Gresty Academy Paper 2 · Q7

Paper 2Algebra
10002−9992+9982−9972+……+42−32+22−12=\begin{aligned} 1000^2-999^2+998^2-997^2+{}&\ldots\\ &\ldots+4^2-3^2+2^2-1^2= \end{aligned}
A999,999999{,}999
B1,000,0001{,}000{,}000
C1,001,0001{,}001{,}000
D500,500500{,}500

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