falestinem1132 falestinem1132

01-08-2019
Mathematics

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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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samrinc samrinc

01-08-2019

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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