Question

What is the formula for the sum of the first n positive even integers? What is it in Sigma notation?

Answer 1

I actually think the formula is n(n+1) by looking online. I just can't figure out how this is derived.

Answer 2

oh, you are right! i now understand the question

Answer 3

Do you know how that formula is derived?

Answer 4

2+4+6+......+2n=2(1+2+3+....+n)=2*n(n+1)/2=n(n+1)

or