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  1. Find the value of the expression 1 - 2 + 3 - 4 + 5 - 6 + 7 + .... upto 100 terms . ?
    1. -150
    2. -60
    3. -100
    4. -50
Correct Option: D

(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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