OpenStax, Algebra and Trigonometry 2e §13.5 Counting Principles · Exercise 40 · Combinatorics · Permutations & combinations
Counting Principles · Exercise 40
Find the distinct number of arrangements.
The symbols in the string #,#,#,@,@,$,$,$,%,%,%,%
OpenStax, Algebra and Trigonometry 2e · §13.5 Counting Principles · Exercise 40
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Checked against the answer in OpenStax, Algebra and Trigonometry 2e.