The storeroom has received 19 dozen disposable pipettes and 1 dozen class A pipettes (definitely not disposable). The new stock boy, not realizing that the pipettes were of two different varieties, yesterday opened all 20 dozen packets, mixed them, and placed all the pipettes in the same supply bin. What are the chances that you will receive one, two, or five class A pipettes when you check out a dozen tomorrow?
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