A lot of 103 semiconductor chips contains 20 that are defective. (a) Two are selected, one at a time and without replacement from the lot. Determine the probability that the second one is defective. (b) Three are selected, one at a time and without replacement. Find the probability that the first one is defective and the third one is not defective.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A lot of 103 semiconductor chips contains 20 that are defective.
(a) Two are selected, one at a time and without replacement from the lot. Determine the probability that the
second one is defective.
(b) Three are selected, one at a time and without replacement. Find the probability that the first one is defective
and the third one is not defective.
Transcribed Image Text:A lot of 103 semiconductor chips contains 20 that are defective. (a) Two are selected, one at a time and without replacement from the lot. Determine the probability that the second one is defective. (b) Three are selected, one at a time and without replacement. Find the probability that the first one is defective and the third one is not defective.
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