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2 March, 11:16

A box contains four 40-W bulbs, five 60-W

bulbs, and six 75-W bulbs. If bulbs are se-

lected one by one in random order, what is

the probability that at least two bulbs must be

selected to obtain one that is rated 75W?

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Answers (1)
  1. 2 March, 12:38
    0
    So first one is not a 75W bulb:

    P (not a 75Wbulb) = (4+5) / (4+5+6) = 9/15

    P (a 75W bulb) = 6 / (15-1) = 6/14

    9/15*6/14=9/35
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