Question

Question1. Find the sum of:

the first 1000 positive integers.​

Answer 1

Answer:

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Step-by-step explanation:

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

Explanation :- Sum = n(n+1)÷2

so,1000×(1000+1)÷2

= 1000×1001×1/2

= 500×1001

= 500500

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