Posted by allen on Sunday, December 13, 2009 at 9:19pm.
This is an example of conditional probability
P(A│B) read: the probabiltiy of B, given A
= P(A and B)/P(B)
P(A and B) = (1/6)(1/2) = 1/12
P(B) = 1/2
so P(A│B) = (1/12)/(1/2) = 1/6
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