SOLUTION: a bag contains 10 marbles (4 red, 2 white and 4 blue). if you select 3 marbles at random from the bag without replacement, what is the probability ( as a common fraction) that exac
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-> SOLUTION: a bag contains 10 marbles (4 red, 2 white and 4 blue). if you select 3 marbles at random from the bag without replacement, what is the probability ( as a common fraction) that exac
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Question 440511: a bag contains 10 marbles (4 red, 2 white and 4 blue). if you select 3 marbles at random from the bag without replacement, what is the probability ( as a common fraction) that exactly two of the marbles selected will be red?
Plz help me fast this problem is killing me! Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website! nCr=Combination of n things taken r at a time
((4C2)(6C1))/10C3 Combination of 4 red balls taken 2 at a time times one of the six other balls, all divided by the combination of 10 balls take 3 at a time.
=(6*6)/120
=36/120
=3/10
.
Ed
