# Summation question

Gold Member
hey pf!

can someone explain to me what to do if presented with an equation like this: $$\sum_{i=1}^{n}A_i=i$$
is this identical to stating $A_i=i$? either way, can you please explain.

thanks!

josh

Mentor
hey pf!

can someone explain to me what to do if presented with an equation like this: $$\sum_{i=1}^{n}A_i=i$$
is this identical to stating $A_i=i$? either way, can you please explain.

thanks!

josh
It doesn't make much sense to me. On the left side, i is an index variable that takes on the values 1, 2, 3, ..., n, so I have no idea what it means on the right side.

Where did you see this? If it's from a textbook, can you post a picture?

$$\sum_{k=1}^n A_k = i$$