Mathematics
Statistics
A batch of 20 used automobile alternators contains 4 defectives.

A batch of 20 used automobile alternators contains 4 defectives.

A batch of 20 used automobile alternators contains 4 defectives. If 3 alternators are sampled at random, find the probability of the event
(a) A = [None of the defectives appear]
(b) B = [Exactly two defectives appear]

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