# Give an example of such a convergent series

1. Sep 17, 2008

### gas8

1. The problem statement, all variables and given/known data

Give an example of a convergent series $$\Sigma$$ z$$_{n}$$

So that for each n in N we have:

limsup $$abs{\frac{z_{n+1}}{z_{n}}}$$ is greater than 1

2. Sep 17, 2008

### Dick

Re: Series

How about combining the convergent series 2^(-n) and 3^(-n) in a clever way? Hint: alternate terms from each.

3. Sep 18, 2008

### gas8

Re: Series

yeah thx, I used 2^(-n) when n is even and 2^-(n+1 ) when n is odd

4. Sep 18, 2008

### Dick

Re: Series

Something like that will work, but doesn't that just give you limsup=1?