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1002−992+982−972+962−952+⋯+22−12= ? 100^2 - 99^2 + 98^2 - 97^2 + 96^2 - 95^2 +\cdots +2^2 - 1^2 = \, ? 1002−992+982−972+962−952+⋯+22−12=?
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