The personal identification numbers (PINs) for automatic teller machines (ATMs) usually consist of four digits.  Suppose PINs are assigned at random so that all  4-digit numbers are equally likely.  How many possible PINs are there?

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 personal identification numbers (PINs) for automatic teller machines (ATMs) usually consist of four digits.  Suppose PINs are assigned at random so that all  4-digit numbers are equally likely.  How many possible PINs are there? 

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