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2 June, 18:44

in a box of 12 fuses, there are 3 that are defective. if a quality control engineer tests 4 of these fuses at random, what is the probability that he does not find any of the defective fuses?

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  1. 2 June, 18:53
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    3/12, or 1/4, are defective.

    he tests 4/12, or 1/3, fuses.

    1/4 (1/3) = 1/12?

    i'm sorry if this is wrong. i'm not good at probability!
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