Posted by sarah on .
for each series determine if the series is absolutely convergent and convergent
the sum from 0 to infinity of (1)^n/(the square root of (n+1))
I did the ratio test and got 1, which is less than 0 making it absolutely convergent, but do i need to take the absolute value of 1? which would then make the test inconclusive?

calculus 
Count Iblis,
Yes, you need to take the absolute value of everything, so you get 1 which is inconclusive. If you do the integral test, you find that it diverges.