Hello,
I need help with this problem. The solution has been posted by my professor, but I'm still not understanding how to know when to do certain things and don't follow some of the logic leaps in his solution. I understand that he is showing that the two conditions are being met, but...
1) how do you know that bn is decreasing?
2) why is bn then differentiated?
3) how do you know that f'(x) < 0?
Also, I can see that he applied the integral test to show that the series is divergent, but can I see a workthrough of that so that I can show it on my test if I get a similar problem?
Please try to keep the logic leaps between steps to a minimum as I am having trouble following the logic of this problem.
Thank you
d) Σ (-1)"-1 Inn n=1