For any positive integer n, the sum of the first n positive integers equals n(n+1)/2.

For any positive integer n, the sum of the first n positive integers equals n(n+1)/2. What is the sum m of all the even integers between 99 and 301?

Quiz

Answer/Solution

20,200

Steps/Work

I would solve it in a different way.
First of all, total number of even integers between 99 and 301 are, (301-99)/2 = 202/2=101
Average = (301+99)/2 = 400/2 = 200
Sum m= Average*total count = 200*101 = 20,200
Answer is B

General Calculator / Auto Solver

For any positive integer n, the sum of the first n positive integers equals n ( n + ) / . What is the sum m of all the even integers between and ?

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