Combination and summation notation.

[EV33]

Homework Statement

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.

Homework Equations

When I say combination I am talking about this formula n!/(k!(n-k)!)

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.

 

[rock.freak667]

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