Hi again, as I was doing more questions on this, I got stuck on two more questions.

1. ∑(from n=1 to infinity) ((-1)^(n+1)/ √n )

2. ∑(from n=1 to infinity) ( ln (1+1/n) )

Well Q1, same as before I tried ratio test and it turned out weird...

For Q2,not sure if I did it right, here's what I did. I compute the partial sums:

s1= ln(1+1)

s2= ln(1+1) + ln(1+1/2) > ln(1+1/2) + ln(1+1/2) = 2 ln(1+1/2)

and so lim for n to infinity for ln(1+1/n) = infinity

therefore the sequence of the partial sum diverges to infinity and so the sequence also diverges. Is this right?

Thanks.