SOLUTION: The shipment of 15 washing machines contains 3 diffective pieces.in how many ways can a firm selling.washing machines purchase 5 machines and receive and at least 2 diffective piec

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Question 985467: The shipment of 15 washing machines contains 3 diffective pieces.in how many ways can a firm selling.washing machines purchase 5 machines and receive and at least 2 diffective pieces
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
There are 3 defective pieces and 12 non-defective pieces.

Number of ways to receive exactly 2 defective pieces and 3 non-defective pieces:

3C2*12C3

Number of ways to receive exactly 3 defective pieces and 2 nondefective pieces:

3C3*12C2

Answer 3C2*12C3 + 3C3*12C2

Edwin