Question

find the sum of first 1000 positive integers ?
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Answer 1

Answer:

500500

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Answer 2

Answer:

Sum of first 1000 positive integers positive integers start from 1

so, 1,2=3,4,.........1000

We hve to find the sum, so we use the formula

Sum= n/2(2a+(n-1)d)

here a=1

d=2-1=1

n=1000

putting these values in formula

sum= n/2(2a+(n-1)d)

sum= 1000/2(2×1+ (1000-1)1)

sum= 1000/2(2+999)

sum = 500×1001

sum = 500500....