# SOLUTION: 2 marbles are selected at random from an urn which contain 4 white and 8 black marbles. what is the probability that both marbles will be white?

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 Question 473225: 2 marbles are selected at random from an urn which contain 4 white and 8 black marbles. what is the probability that both marbles will be white?Answer by stanbon(57219)   (Show Source): You can put this solution on YOUR website!2 marbles are selected at random from an urn which contain 4 white and 8 black marbles. what is the probability that both marbles will be white? ---- # of ways to select 2 white marbles: 4C2 = 6 --- # of ways to select 2 marbles randomly: 12C2 = 66 ---- P(2 white) = 6/66 = 1/11 =============================== Cheers, Stan H. ==========