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The probability of pulling a black bal out of a glass jar is

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The probability of pulling a black bal out of a glass jar is [#permalink] New post 10 Jul 2006, 16:58
9. The probability of pulling a black bal out of a glass jar is 1/x. The probability of pulling a black ball out of a glass jar and breaking the jar is 1/y. What is the probability of breaking the jar?

I thought it would be 1/(x-y) but that is wrong the answer is X/Y

Help me understand.
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Andre Crompton
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Re: Combination and prob. [#permalink] New post 10 Jul 2006, 17:36
andrecrompton wrote:
9. The probability of pulling a black bal out of a glass jar is 1/x. The probability of pulling a black ball out of a glass jar and breaking the jar is 1/y. What is the probability of breaking the jar?

I thought it would be 1/(x-y) but that is wrong the answer is X/Y

Help me understand.


Let A - prb. of taking the ball out
B - prob. of breaking the jar

P(AB) = P(A) * P(B)
1/y = 1/x * P(B)
p(B) = x/y
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 [#permalink] New post 10 Jul 2006, 18:47
P(A and B) = P(A) * P(B)

1/y = 1/x * P(B)

P(B) = x/y
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

  [#permalink] 10 Jul 2006, 18:47
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The probability of pulling a black bal out of a glass jar is

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