Evaluate (8 Sigma n-1)n.

Question

Where 8 is on top and n-1 is on the bottom and n is on the right.

A) 36
B) 8***
C) 40
D) 24

Answer 1

At the bottom of the sigma I am sure it said n = 1 , not n-1

If so, then you want
1+2+3+4+5+6+7+8
which is easy to do in your head

certainly not 8 !

Answer 2

It says n-1. I will do it your way though since it makes the most sense to me. The equal sign must be squished or something.