Many banks require customers who use the automated teller machine (ATM) to enter a four-digit password before they begin a transaction. (a) How many possible four-digit passwords are there? (b) How many four-digit passwords contain no 3s?

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter9: Counting And Probability
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Problem 4T: Over the past year, John has purchased 30 books. In how many ways can he pick four of these books...
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Many banks require customers who use the automated teller machine (ATM) to enter a four-digit password before they begin a transaction.

(a) How many possible four-digit passwords are there?
(b) How many four-digit passwords contain no 3s? 

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