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m a shipment of 60 transistors, 5 of which are defective, a sample of 4 transistors...

m a shipment of 60 transistors, 5 of which are defective, a sample of 4 transistors is selected at random.

(a) In how many different ways can the sample be selected?
ways

(b) How many samples contain exactly 3 defective transistors?
samples

(c) How many samples do not contain any defective transistors?
samples

Math   Advanced-Math   
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