21. A campus telephone extension has four digits. How many different extensions with no repeated digits exist?

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21. A campus telephone extension has four digits. How many different extensions with no repeated digits exist? Of these,

(a) how many do not start with a 0;

(b) how many do not have 01 as the first two digits?

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Fundamentals Of Probability With Stochastic Processes

ISBN: 9780429856273

4th Edition

Authors: Saeed Ghahramani

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Question Posted: Nov 16, 2024 02:00 AM

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21. A campus telephone extension has four digits. How many different extensions with no repeated digits exist?

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Fundamentals Of Probability With Stochastic Processes

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