# Combination and summation notation.

1. Aug 1, 2010

### EV33

1. The problem statement, all variables and given/known data
I am having trouble reading this notation

$$\sum$$ (i/k)

The sum is from i=0 to n

I wasn't sure how to write the combination of i,k on the computer so I just wrote it as i/k.

2. Relevant equations

3. The attempt at a solution

Is this just (0/k)+(1/k)+(2/k)...(n/k)

I am sure I am interpeting it wrong but If I am not what do you do for situations where n is less than k because when you do the combination you get n!/(k!(n-k)!), and I don't think it is possible to do a negative factorial.

2. Aug 1, 2010

### rock.freak667

I don't think 'n' can be less than 'k' for the reason you said.