Mathematics, 29.01.2022 09:10 lifeisgaming37

In a shipment of 22 smartphones, 2 are defective. How many ways can a quality control inspector randomly test 4 smartphones, of which 2 are defective? (a) there are no restrictions on the order
(b) all the bands of each type must perform in a row

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In a shipment of 22 smartphones, 2 are defective. How many ways can a quality control inspector rand...