Homework Help: math

Posted by meep on Saturday, January 12, 2013 at 3:52pm.

Daniel will randomly pick a marble from a bag that has three red marbles and six white. If he does not put any marble back into the bag and picks a new one each time, what is the probability that both marbles will be white. If he puts the first marble back into the bag and picks another, what is the probability that both are white?

math - Reiny, Saturday, January 12, 2013 at 4:40pm
Prob(2 white without replacement)
= (6/9)(5/8)
= 5/12

prob(2 white with replacement)
= (6/9)(6/9)
= 4/9

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