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?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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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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