SOLUTION: a bag has 2 red martbles 3 green marbles and 1 blue marble. if you randomly take out 2 marbles at once whats the probability of getting a blue and a green marble?
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Question 248546: a bag has 2 red martbles 3 green marbles and 1 blue marble. if you randomly take out 2 marbles at once whats the probability of getting a blue and a green marble?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
nCr=n!/((n-r)r!) Combination of n things taken r at a time.
.
2C6=15 all marbles
.
1C1=1 blue
3C1=3 green
2C0=1 red
.
(1*3*1)/15= 1/5 probability of getting a blue and a green.
.
Ed
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