Homework Help: Can you check to see if i expressed the sums in closed form correctly?

1. Oct 28, 2006

mr_coffee

Hello everyone, I was wondering if someone can double check my work for #'s 25 and 31.

The directions say:
Express each of the sums in closed form (without using a summation symbol and without using an ellipis...).

http://img224.imageshack.us/img224/3514/lastscanle2.jpg [Broken]

Thanks!

Last edited by a moderator: May 2, 2017
2. Oct 28, 2006

Office_Shredder

Staff Emeritus
You used the index from the sum instead of the limit. So 25 should be 5m not 5i

Also, 31 is (1 + 1/2)n, which means not only should you have gotten 3/2n, but it should have been (3/2)n

3. Oct 29, 2006

mr_coffee

thanks alot for catching those errors!