Find the sum of the first 40 terms of the series 12 – 22 + 32 – 42  + ……

(a) 820
(b) – 820
(c) 870
(d) – 870

Anurag Mishra Professor Asked on 29th February 2016 in Maths.
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    Answer: (b) -820 

    Anurag Mishra Professor Answered on 1st March 2016.
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