Question

Find the sum of first 1000 positive integer.

Answer 1

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....

hope this will help u.

Answer 2

Answer:500500

Step-by-step explanation:

Sum of first n positive integers is n(n+1)/2

Here n=1000

So sum= (1000x1001)/2=500500