How many m-digit decimal sequence (using digits 0, 1, 2, ... , 9; repetition may happen) are there in whichdigits 1, 2, 3 all appear?

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section: Chapter Questions
Problem 12RE: How many terms are in the finite arithmetic sequence 12,20,28,...,172 ?
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How many m-digit decimal sequence (using digits 0, 1, 2, ... , 9; repetition may happen) are there in which
digits 1, 2, 3 all appear?

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