# Homework Help: Index of summation question

1. Sep 24, 2006

### barksdalemc

I have a problem with an inequality. In the numberator of one term I have X sub k, and in the denominator I have the sum X sub ks from 1 to n. So lets say I use n=2 and have two terms in the denominator Xsub1 and Xsub2. What am I using for the X sub k in the numerator. It definitely is not X sub n.

2. Sep 24, 2006

The k in the numerator does and can not have anything to do with the k in the denominator, unless I'm missing something.

3. Sep 24, 2006

### barksdalemc

The same that I am missing I think. There has to be another summation for that k to exist in the numerator right?

4. Sep 24, 2006