Question about probability

Reference no: EM1375986

3-defective electric toothbrushes were accidentally shipped to a drug store called Clean brush items along with seventeen 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?

Reference no: EM1375986

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