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Urgent probability question watch

1. In a game n(greater than or equal to)6 balls coloured red and black are placed in a bag and one is selected. The proportion of red to black balls in the bag is determined by the roll of a dice. If an even number is thrown that number of red balls are placed in a bag. If an odd number is thrown that number of balck balls are.

i) what is the prob of selecting a black ball - I've got this as: (n-1)/(2n)

One I'm stuck on - ii) If a black ball is selected what is the prob that the dice showed a 6 - (Bayes theorem i think but am having trouble applying it)

iii) What is the prob of selecting a black ball as n tends to infinity. is this what you expected?

I'm so desperate I've been trying to do it for ages and am close to giving up... if anyone could help I'd REALLY apprieciate it!!!!

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Pleeeeeeeease I'm so desperate!!!
2. Please type out the question exactly.
3. Please type out the question exactly. I don't understand it.
4. (Original post by Jonny W)
Please type out the question exactly. I don't understand it.
That exactly what the question says
5. (Original post by wibble...)

iii) What is the prob of selecting a black ball as n tends to infinity. is this what you expected?
(
you have to consider what happens to (n-1)/(2n) as n tends to infinity.

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Updated: November 16, 2005
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