Statistics
posted by Sean .
A raffle is being conducted with 50 tickets to be sold  one per customer.
There are three prizes to be awarded.
If the four organizers of the raffle each buy one ticket, what is the probability that the four organizers win:
a) all of the prizes?
b) exactly two of the prizes
c) exactly one of the prizes
d) none of the prizes
This is at the end of a chapter on counting combinations/permutations

Perhaps something here will help you?
http://www.google.com/search?hl=en&client=firefoxa&rls=org.mozilla:enUS:official&hs=qy7&ei=T0VOSvDIFYnENrLQge4D&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=counting+combinations/permutations&spell=1
Sra 
I know the fundamental formulas and their derivations really well. This problem demands a more complicated application that I'm struggling with...

all of the prizes:
4/50*3/49*2/48*1/47
Two of the prizes:
4/50*3/49*46/48*45/47
See the pattern?