Question

1-2+3-4+5-6+....... +17-18+19-20
=_______​

Answer 1

Answer:

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

Step-by-step explanation:

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Answer 2

Answer:

-10

Step-by-step explanation:

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

-1+-1+-1+-1+-1+-1+-1+-1+-1+-1

-1-1-1-1-1-1-1-1-1-1

-10

I hope it will help you