SOLUTION: During a sale, 1/6 of the CD prices are reduced. Find the probability that 2 of 4 randomly-selected CDs have reduced prices? Thanks

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Question 41640: During a sale, 1/6 of the CD prices are reduced. Find the probability that 2 of 4 randomly-selected CDs have reduced prices?
Thanks
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
(r + n)^4 = 1r%5E4n%5E0+%2B+4r%5E3n%5E1+%2B+6r%5E2n%5E2+%2B+4r%5E1n%5E3+%2B+1r%5E0n%5E4 where r is reduced prices and n is not reduced prices
6r%5E2n%5E2
6%281%2F6%29%5E2%285%2F6%29%5E2
6%281%2F36%29%2825%2F36%29
25%2F216 or 11.57%