A box contains six 40-W bulbs, five 60-W bulbs, and four75-W bulbs. If bulbs are
Chapter 2, Problem 18(choose chapter or problem)
A box contains six 40-W bulbs, five 60-W bulbs, and four75-W bulbs. If bulbs are selected one by one in randomorder, what is the probability that at least two bulbs must beselected to obtain one that is rated 75 W?
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