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September 4th, 2008, 11:56 PM  #1  
Newbie Joined: Sep 2008 Posts: 1 Thanks: 0  An urn contains a azure balls and c carmine balls.. (Help) Quote:
Thanks!  
September 5th, 2008, 03:10 AM  #2 
Member Joined: Sep 2007 Posts: 30 Thanks: 0  Perhaps you could try a few examples
That's a good question and I don't know the exact approach but if I were to try to solve it I would run through a couple of examples on paper. First I would go through all the combinations of 2 azure and 1 carmine balls and see how the probability works out. Next I would go through all combinations of 3 and 2 balls or 3 and 1 ball. From these examples you may be able to pick out the pattern for a and c balls. 
September 10th, 2008, 09:39 AM  #3 
Senior Member Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3  Re: An urn contains a azure balls and c carmine balls.. (Help)
Hmm... this is a tricky question, but some things to think about that *may* help: What is the probabilty that your first azure ball happens on the kth selection? First carmine ball? Then you have (a+c)+1k balls remaining: How many azure balls do you have? How many carmine? (I.e. what is the probability of selecting an a or a c?) You have to do something inductive, I would assume. 

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azure, balls, carmine, urn 
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