Find the value of the expression 1 - 2 + 3 - 4 + 5 - 6 + 7 + .... upto 100 terms .?

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Accepted Answer

(1 - 2) = -1 (3 - 4) = -1 (5 - 6) = -1 and so on. ∴ Total terms of -1 will be 50. ∴ Answer = -1 x 50 = -50

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