the value of 1 - 2 + 3 - 4 + 5- 6+____+19-20 is
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the value of 1 - 2 + 3 - 4 + 5- 6+____+19-20 is
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1-2+3-4+5-6+7-8+9-10+11-12+13-14+15-16+17-18+19-20
= -10
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Answer:
1-2=1+3=4-4=0+5=5-6=1+19-20=0