Question 837396: a box contains 3 red marbles and 6 blue marbles and 1 white marble. the marbles are selected at random,, one at a time, and are not replaced. find the probability
Found 2 solutions by Fombitz, Edwin McCravy:
Answer by Fombitz(32388)   (Show Source):
Answer by Edwin McCravy(20060)  (Show Source):
You can put this solution on YOUR website! A box contains 3 red marbles and 6 blue marbles and 1 white marble.
I will guess at something you may have wanted that you didn't tell us.
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A. TWO marbles are selected at random, and the first one is not replaced
before the second one is drawn. Find the probability:
10. P(Blue 1st then Red 2nd) =  =  = 
11. P(Blue 1st then Blue 2nd) =  =  = 
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B. THREE marbles are selected at random,, one at a time, and are not
replaced. Find the probability:
12. P(Red 1st, White 2nd, then Blue 3rd) =  =  = 
13. P(Red 1st, Red 2nd then Red 3rd) =  =  = 
14. P(White 1st, Red 2nd, then White 3rd) = 0
That's because there is only 1 white marble. Since we don't replace the
first white marble, it is impossible to get it third.
Edwin
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