Question

0-1+2-3+4-5+6-7..........+16-17+18-19+20
What is the value

Answer 1

Answer:

10

Step-by-step explanation:

S =n/2{2a+(n-1)d}

n

Answer 2

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Answer:

10

Step-by-step explanation:

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

=- 100+110

= 10.

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