(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I have a question about the formula for drawing without replacement and considering results to be unordered.

I understand with remembering order it is

n!/(n - k)!

but why do we divide by k! for unordered?

(n is # of different outcome for each draw, k is # of draws)

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Probability question

**Physics Forums | Science Articles, Homework Help, Discussion**