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How many 5-digit numbers can be formed from the integers

Chapter 1, Problem 10STE

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QUESTION:

Problem 10STE

How many 5-digit numbers can be formed from the integers 1,2,... ,9 if no digit can appear more than twice? (For instance, 41434 is not allowed.)

Questions & Answers

QUESTION:

Problem 10STE

How many 5-digit numbers can be formed from the integers 1,2,... ,9 if no digit can appear more than twice? (For instance, 41434 is not allowed.)

ANSWER:

Step 1 of 2

Our goal is:

We need to find how many 5-digit numbers can be formed from the integers 1,2,... ,9 if no digit can appear more than twice.

We know that there are 3 cases.

 

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