Suppose that five good fuses and two defectives have been mixed up. To find the defective fuses we test What is the probability that we are lucky and find both defective fuses in the first two tests?

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter8: Sequences, Series, And Probability
Section8.CT: Chapter Test
Problem 30CT: In a batch of 20 tires, 2 are known to be defective. If 4 tires are chosen at random, find the...
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Suppose that five good fuses and two defectives have
been mixed up. To find the defective fuses we test
them one by one, at random, without replacement.
What is the probability that we are lucky and find both
defective fuses in the first two tests?
Repeat this exercise if we must find both defective fuses
in exactly three tests.
Transcribed Image Text:Suppose that five good fuses and two defectives have been mixed up. To find the defective fuses we test them one by one, at random, without replacement. What is the probability that we are lucky and find both defective fuses in the first two tests? Repeat this exercise if we must find both defective fuses in exactly three tests.
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