- #1
MySecretAlias
- 6
- 0
Homework Statement
Decide whether convergent or divergent, if convergent, find sum.
Ʃ as n = 1 and goes to infinity > (3^n + 2^n)/6^n
Homework Equations
a/1-r
The Attempt at a Solution
I'm just confused where to find the "r" to this without actually plugging in values for n, then dividing. For example, to get the answer (at least I think it's correct), I plugged 1 in for n, got 5/6, then i plugged in 2 for n, and got 11/36. I did (11/36) / (5/6), and used that for my r value, plugged that into a/1-r, and got about 1.31
How exactly do I find the r value? Thanks.