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The probability of pulling a black ball out of a glass jar [#permalink]
13 Mar 2005, 13:02

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).

Where P(A) = probability of being black
P(B) = Probabilty of breaking the jar

from the data in the prob, 1/y = (1/x) * P(B|A) = x/y.

Not sure if this is the right approach for this problem. As x/y gives the probability of breaking the jar given that a black ball is drawn from the jar.

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