Question

Calculate:1-2+3-4+5-6.....+999-1000

Answer 1

Answer:

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Step-by-step explanation:

1-2= -1

3-4= -1

5-6= -1

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999-1000= -1

then

= -1-1-1-1-1-1-1-1...............-1

= -(1+1+1+1+1+1+1+1+1+.......+1)

= -500