#Mathematics

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The following sum is 1+1-2+3-4+5-6........-20=?

muskan singh 25th Nov, 2018

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Kishor Biradar 10th Feb, 2020

1+1-2+3-4+5-6+7-8+9-10+11-12+13-14+15-16+17-18+19-20= -9

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harsh Student Expert 2nd Dec, 2018

1 +
1+3+5+7+9+11+13+15+17+19
-2-4-6-8-10-12-14+16-18-20
=-9

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Vikas gehlot 26th Nov, 2018

I think this is a Very simple question of Sequence and Series. The sum You can easily find out By making a combination of Two terms Together then all will be reduced to only -1. There will be Total ten -1 which means the sum will be -9, It is a very trivial question.

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