Posted by Andrey L on Tuesday, April 21, 2009 at 2:13pm.
This conditional probability
the formula is
P(A│B), read the prob of A given B
= P(A and B)/P(B)
in your case Prob(A) is Prob(green)
B is "not red or blue"
so find Prob(green AND "not red or blue")
and Prob(not red or blue) and sub into the formula
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