Chapter 12 - Counting and Probability - Section 12.1 Counting - 12.1 Assess Your Understanding - Page 867: 25

9000 different 4-digit numbers

Work Step by Step

There are 9 selections for the first choice ( because 0 is excluded) and 10 selections each for the second, third and fourth choices. Using the fundamental principle of counting, the number of 4-digit numbers that can be formed is: $= 9\times10\times10\times10 \\= 9000$

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