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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