2. A shipment of 40 fancy calculators contains 5 defective units. In how many ways can...
2. A shipment of 40 fancy calculators contains 5 defective units. In how many ways can a college bookstore buy 20 of these units and receive:
a) no defective units
b) one defective unit
c) at least 17 good units
d) What is the probability of the bookstore receiving 2 defective units?
e) Find the probability of receiving at most 2 bad calculators.
f) Find the probability of receiving at least 4 defective units.
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