SOLUTION: In a shipment of 19 smartphones, 2 are defective. How many ways can a quality control inspector randomly test 5 smartphones, of which 2 are defective?

Algebra ->  Permutations -> SOLUTION: In a shipment of 19 smartphones, 2 are defective. How many ways can a quality control inspector randomly test 5 smartphones, of which 2 are defective?       Log On

In each such a group, there are 3 good and 2 defective items.


So, the number of ways is equal   =  =  = 680.    ANSWER