Admittedly, probability is a weak area for me because I don't remember ever taking anything like it in high school or college (never took statistics). I have a question about a formula. I recently learned the formula to be as follows:
If you have n items, taken r at a time, the total number of possible combinations can be found as such:
C(n,r) = n! / r! (n-r)!
However in most of the problems I've seen nobody is using that exact formula. Instead they are using something else. I can't remember it exactly and I can't seem to find an example but it's something like
n!/r! * n!
What is difference in the two ways of finding the answer? Hopefully someone knows what I'm talking about because I'll admit I'm even starting to confuse myself...lol.
If you have n items, taken r at a time, the total number of possible combinations can be found as such:
C(n,r) = n! / r! (n-r)!
However in most of the problems I've seen nobody is using that exact formula. Instead they are using something else. I can't remember it exactly and I can't seem to find an example but it's something like
n!/r! * n!
What is difference in the two ways of finding the answer? Hopefully someone knows what I'm talking about because I'll admit I'm even starting to confuse myself...lol.
