Answers

2016-03-13T19:40:30+05:30
(100^2 - 99^2) + (98^2 - 97^2) +........ - 3^2 + (2^2 - 1^2) = (100 + 99)(1) + (98 + 97)(1) + .... + (2 + 1)(1) = 100 + 99 + 98 + ... + 2 + 1 = 5050
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