Question

1+2+3+4+5...............998+999+1000
$1 + 2 + 3 + 4 + 5.......... + 998 + 999 + 1000 =$


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Answer 1

Answer:

500500

I am attaching two methods.

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Answer 2

Here a1=1
and an=1000
Sum of number =n(a1+an)/2
=1000(1+1000)/2
=1000(1001)/2
=1000(500.5)
=500500