4. Suppose there are four products, let be the event that the ith product is salable product (i = 1, 2, 3, 4), try to use A, (i = 1, 2, 3, 4) represents the following events: (1) None of them is defective; at least one of them is defective; (3) only one of them is defective; at least two of them are not defective. (2) (4)

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