The following sum is 1+1-2+3-4+5-6........-20=?
Answers (3)
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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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
1+3+5+7+9+11+13+15+17+19
-2-4-6-8-10-12-14+16-18-20
=-9
Comments (0)
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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