SOLUTION: A shipment of 29 flat screen televisions contains three defective units. In how many ways can a vending company purchase four of these units and receive the following? (a) all g

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Question 1179091: A shipment of 29 flat screen televisions contains three defective units. In how many ways can a vending company purchase four of these units and receive the following?
(a) all good units
(b) two good units
(c) at least two good units
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
29 units: 26(good) and 3(def)
purchase 4: Ways...
(a) all good units: 26C4 = 14,950
(b) two good units: (26C2)(3C2) = 975
(c) at least two good units:
 (26C2)(3C2) + (26C3)(3C1) + 26C4 = 14,950 + 7800 + 975
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