Posted by Andrey L on Tuesday, April 21, 2009 at 2:13pm.
A bag contains 5 red, 3 green, 12 white and 7 blue marbles. One is drawn at random. With is the probability it is green if it is not red or blue?

Probabilities  Reiny, Tuesday, April 21, 2009 at 4:06pm
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

Probabilities  Teresa, Wednesday, October 23, 2013 at 11:06pm
There'sa100 red 50 green and 50 blue beads in a jar what's the probability that I'll pull out a blue bead
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