defective electric toothbrushes were accidentally shipped to a
drugstore by Cleanbrush Products along with 17 nondefective ones.
What is the probability the first two electric toothbrushes sold will be returned to the drugstore because they are defective? (Round your answer to 3 decimal places.)
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probability = probablility the first tooth brush is defective and probability the 2nd tooth brush is deffective
= 3/20 *2/19 = 0.01579 = 0.016
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