A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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Question

Please help to solve and explain into details. I want to understand the process of solving it. Thank you very much. 

An urn contains forty red marbles and sixty green marbles. Two marbles are selected and discarded, and then a
third marble is selected. What is the probability that the third marble is red?

Expert Solution
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Step 1: Provided data

An urn contains 40 red marbles and 60 green marbles. 

Total number of marbles in the urn is 40 plus 60 equals 100

It is given that two marbles are selected and discarded. 

Remaining marbles in urn after discarding two marbles is 100 minus 2 equals 98.


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