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Probability of Pulling & Breaking

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by franciskyle » Mon Apr 20, 2009 2:41 pm
The probability of pulling a black ball 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?

a) 1/(XY).
b) X/Y.
c) Y/X.
d) 1/(X+Y).
e) 1/(X-Y).
k. Francis
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Source: — Problem Solving |

by franciskyle » Mon Apr 20, 2009 2:43 pm
Sorry, I just figured it out just after I pressed submit.

Here is my solution:

[spoiler]A * 1/X = 1/Y

A = (1/Y) / (1/X)

A = X / Y[/spoiler]
k. Francis
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by dumb.doofus » Mon Apr 20, 2009 3:50 pm
question on conditional probability..

P(b/a) = P(b intersection a)/P(a)
= 1/y/1/x
= x/y
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