Find an+1 in Alternating Series: Is Plugging in "n+1" Right?

[Ki-nana18]

I'm confused as to how to find a_n+1. I can figure out how to find the limit of a_n, which is the first component of the alternating series test. How do you find a_n+1? I'm thinking you just plug in "n+1" for "n" is that right?

 

[Mark44]

If you're working with a summation, you have a formula for a_n. If you want a_n+1, substitute n+1 instead of n in the formula for a_n.

 

[Ki-nana18]

Thank you! According to the back of the book I got the right answer. YES!