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Three defective electric toothbrushes were accidentally shipped to a drugstore by the manufacturer along with 16...

Three defective electric toothbrushes were accidentally shipped to a drugstore by the manufacturer along with 16 nondefective ones.
(a) What is the probability the first two electric toothbrushes sold will be defective?
(b) What is the probability the first two electric toothbrushes sold will not be defective?
Math   Statistics-And-Probability   
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