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The following sum is 1+1-2+3-4+5-6........-20=?
Answers (3)
1+3+5+7+9+11+13+15+17+19
-2-4-6-8-10-12-14+16-18-20
=-9
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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