What is the sum of the first 25 even numbers?

Answer 1

Oh honey, you're really asking me to add up the first 25 even numbers? Bless your heart. Well, technically speaking, the sum of the first 25 even numbers is 650. So there you have it, darling. Math can be a real hoot sometimes.

Answer 2

The sum of the first n positive integers (i.e. 1+2+3+...+n) is given by n(n+1)/2

so the sum of the first 25 positive integers is 1+2+3+...+25 = 25x26/2 = 325.

The sum of the first 25 EVEN numbers will be double this i.e. 2+4+6+...+50 = 650.