00:01
Okay, we're supposed to discuss absolute convergence of some infinite series.
00:06
I want to point out that the series that are listed, they're all alternating series, and they all converge using the alternating series test.
00:18
Even number c, which has that logarithm in it, but it still satisfies the conditions of the alternating series test.
00:28
So they all converge conditionally.
00:30
The question is which ones converge absolutely? okay, and so here's the thing.
00:38
Let's look at number a and then think about this.
00:57
So we can't use the p -test on this one because of that logarithm.
01:02
The log of n, actually this is n, not n plus 1.
01:08
We made that change.
01:12
We know the log of n is less than n.
01:15
So that means 1 over log n is greater than 1 over n.
01:30
So therefore, it diverges since the sum of 1 over n does...