Defective Units
A shipment of #a microwave ovens contains #b defective units. In how many ways can a restaurant buy three of these units and recieve:
- no defective units?
{#1}
- one defective unit?
{#2}
- at least two nondefective units?
{#3}
- What is the probability of the restaurant buying at least two defective units?
{#4}
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