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a) from a to of 12 flatres, 4 are selected at random. if the lot contains 4 defective flares (flares that wilt fire), what is the probability that all 4 will not work?

B) what is the probability that at most 2 will not work?

1 answer

a) total ways of drawing any 4
= 12c4 = 495

b)
= 462/495

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