What is the sum of all even numbers between 0 and 398?

Question

What is the sum, of all the even numbers, between 0 and 398?

Answer 1

sum even numbers, start=0, end maebee=398

if inklude 0 & 398, hav 200 numbers

first=0, last=398

sum=n*averaej, n=200

averaej=(0+398)/2=199

sum=200*199=39,800

Answer 2

1. no clue