Can Gauss Test Be Applied to Multiple Series?

[SANGHERA.JAS]

Can Gauss test be applied to second and third series. I am totally confused which test to apply on the first series.

 

[Gregg]

For number 3, use Cauchy's test and remember that

$$\displaystyle \lim_{n\to \infty} \left( 1+\frac{1}{n}\right )^n=e$$

It will also work nicely for the first problem

 

[SANGHERA.JAS]

Thank you Gregg!