Suppose you need to enter a 4 digit code to enter a room. (a) Does the order matter? Why? (b) How many codes are there? (c) How many such codes exists if there are no digits appear twice in your code?

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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Suppose you need to enter a 4 digit code to enter a room.
(a) Does the order matter? Why?
(b) How many codes are there?
(c) How many such codes exists if there are no digits appear twice in your code?

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