How many sequences of 6 positive digits (1-9) contain at least one digit that appears twice?
How many sequences of 6 positive digits (1-9) contain at least one digit that appears twice?
College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter8: Sequences, Series, And Probability
Section8.CR: Chapter Review
Problem 35E: Find three positive geometric means between 2 and 8
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How many sequences of 6 positive digits (1-9) contain at least one digit that appears twice?
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Step 1
We have to determine the total sequences of 6 positive digits (1-9) that contain at least one digit that appers twice.
Now in a number we have 9 possibilities for each digit for 6 digits.
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