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24 December, 04:02

The computer repairman is given 6 computers to fix. He knows that among them there are 5 bad video cards and 4 failed hard drives. What is the probability that the first computer he tries has both problems?

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  1. 24 December, 04:06
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    5/9 because ...

    Probability that the first one has a bad video card: 5/6

    Probability that the first one has a failed hard drive: 4/6

    5/6 x 4/6 = 20/36 = 5/9
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