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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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