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- - **An urn contains a azure balls and c carmine balls.. (Help)**
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An urn contains a azure balls and c carmine balls.. (Help)Quote:
Thanks! |

Perhaps you could try a few examplesThat'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. |

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 k-th selection? First carmine ball? Then you have (a+c)+1-k 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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