Question

What is the sum of all numbers from 1 to 1,000? A. 500 B. 500.5 C. 1,000 D. 1,000.5

Answer 1

The sum of all the integers from 1 to 1,000 is 1,000(1,000 + 1)/2 = 1,000(1,001)/2 =

500(1,001) = 500,500.