The HOD asked the professor to show him 4 answer books without "A", The professor complained that he had to look through 9 books to find the 4 books without "A". What is the probability of this happening?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
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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The HOD asked the professor to show him 4 answer books without "A", The professor complained that he had to look through 9 books to find the 4 books without "A". What is the probability of this happening?
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The probability of the event is,

 

probability=Number of ways to event occurTotal number of possible outcomes

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