There are 10 USB drives in a box and 3 are defective. Two drives are to be selected, one after the other. What is the probability of selecting a defective USB followed by another defective USB?

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asked Mar 7, 2023 181k views

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There are 10 USB drives in a box and 3 are defective. Two drives are to be selected, one after the other. What is the probability of selecting a defective USB followed by another defective USB?

Mathematics
college

Sam Creamer asked

by Sam Creamer

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$|\Omega|=10\cdot9=90\\|A|=3\cdot2=6\\\\P(A)=(6)/(90)=(1)/(15)\approx6.7\%$

Whiteulver answered Mar 12, 2023

by Whiteulver

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