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= 1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + 9 - 10 + 11 - 12 + ...+ 99 - 100
= -1 + -1 + -1 + -1 + -1 ....
= -1 x 100 : 2
= -1 x 50
= - 50
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