Problem 1. We wish to form a 5 digit number using the digits 1, 2, ..., 9. The constraint is that none of the digits should appear more than twice. How many numbers can be formed respecting this constraint?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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Problem 1. We wish to form a 5 digit number using the digits 1, 2,..., 9. The constraint
is that none of the digits should appear more than twice. How many numbers can be formed
respecting this constraint?
Transcribed Image Text:Problem 1. We wish to form a 5 digit number using the digits 1, 2,..., 9. The constraint is that none of the digits should appear more than twice. How many numbers can be formed respecting this constraint?
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