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

A box contains 25 calculators, 4 of which are defective. 4 calculators are selected at random from the box.

Write your answers in the first box as a simplified fraction 

What is the probability that all of the selected calculators are defective?

    The probability that all of the selected calculators are defective is 

What is the probability that none of the selected calculators are defective?

    The probability that none of the selected calculators are defective is

 

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