A box contains four 40-W bulbs, five 60-W bulbs and six 75-W bulbs. If bulbs are selected one by one in random order without replacement, what is the probability that at least two bulbs must be selected to obtain one that is rated 75 W
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Home » Mathematics » A box contains four 40-W bulbs, five 60-W bulbs and six 75-W bulbs. If bulbs are selected one by one in random order without replacement, what is the probability that at least two bulbs must be selected to obtain one that is rated 75 W