How do I graph a summation using a TI 89?

[jaejoon89]

I know how to write it out in the general window, but not in the graphing window (there's no summation option in the graph feature). Is there a way to import it or another way?

 

[JamesF]

Change the graphing mode to sequence.

 

[jaejoon89]

How do I do that?

 

[JamesF]

How do I do that?

you could try RTFM.

(hint: there's a MODE button on the 89. You're trying to change the graph MODE. hmmmm)