A shipment of 10 microwave ovens contains 3 defective units. A restaurant buys three of these units. What is the probability of the restaurant buying at least two non-defective units? The probability of the restaurant buying at least two non-defective units is.
Added by Brian J.
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There are 7 nondefective units and 3 defective units in the shipment. We can choose 2 nondefective units out of 7 in $\binom{7}{2}$ ways and 1 defective unit out of 3 in $\binom{3}{1}$ ways. So, there are $\binom{7}{2} \times \binom{3}{1}$ ways to choose exactly Show more…
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