SOLUTION: A bag of marbles contains seven purple, six gold and five white marbles. You select four. How many ways are there to get at least three purple?

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Question 1199953: A bag of marbles contains seven purple, six gold and five white marbles. You select
four. How many ways are there to get at least three purple?
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
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A bag of marbles contains seven purple, six gold and five white marbles. You select
four. How many ways are there to get at least three purple?
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P(at least three purple) = P(three purple, 1 non-purple) + P(four purples) = 

                         = C%5B7%5D%5E3%2AC%5B6%2B5%5D%5E1 + C%5B7%5D%5E4 = 35*11 + 35 = 420.


ANSWER.  420 different ways.

Solved.