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    Probability of Defective Electric Toothbrushes

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    I have a probability exercise I don't know how to resolve -

    Three defective electric toothbrushes were accidentally shipped to a drug store called 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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    https://brainmass.com/economics/econometrics/probability-defective-electric-toothbrushes-149445

    Solution Preview

    Probability of defective = 3/17

    a. What is the probability the first two electric toothbrushes ...

    $2.19

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