18. A box contains six 40-W bulbs, five 60-W bulbs, and four 75-W bulbs. If bulbs are...

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18. A box contains six 40-W bulbs, five 60-W bulbs, and four 75-W bulbs. If bulbs are selected one by one in random order, what is the probability that at least two bulbs must be selected to obtain one that is rated 75 W?

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