How do I proceed with this series

[frasifrasi]

I am trying to prepare for the final and am not sure how to proceed with this. Am I just supposed to plug in and cancel terms?

--> determine whether diver/conv. If conv, find the sum:

summation from 1 to infinity of 15(5/6)^(n-1)

 

[PowerIso]

hmm

Seems like this can also be seen as 15 * 1/(5/6) * (5/6)^n which reminds me of a geometric series...

 

[frasifrasi]

thank you.