Question: Three defective electric toothbrushes were accidentally shipped to a drugstore

Three defective electric toothbrushes were accidentally shipped to a drugstore by Clean brush Products along with 17 non-defective ones.
a. What is the probability the first two electric toothbrushes sold will be returned to the drugstore because they are defective?
b. What is the probability the first two electric toothbrushes sold will not be defective?


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  • CreatedDecember 10, 2014
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