contestada

Three defective electric toothbrushes were accidentally shipped to a drugstore by cleanbrush products along with 17 nondefective ones.
a. what is the probability the first two electric toothbrushes sold will be returned to the drugstore because they are defective

Relax

Respuesta :

A) P( 1st two def) 3/20 times 2/19
B) P(1st two good) 17/20 times 16/19

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