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Three defective electric toothbrushes were accidentally shipped to a drugstore by Cleanbrush Products along with 17 nondefective ones.

Three defective electric toothbrushes were accidentally shipped to a drugstore by Cleanbrush Products along with 17 nondefective ones.
a. What is the probability the first two electric toothbrushes sold will be returned    to the drugstore because they are defective?
                Show all work, the formula and answer
b.) What is the probability the first two electric toothbrushes sold will not be defective?
            
                Show all work, the formula and answer

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