OpenStax, Algebra and Trigonometry 2e §13.5 Counting Principles · Exercise 42 · Combinatorics · Permutations & combinations
Counting Principles · Exercise 42
The set, consists of whole numbers, each being the same number of digits long. How many digits long is a number from (Hint: use the fact that a whole number cannot start with the digit 0.)
OpenStax, Algebra and Trigonometry 2e · §13.5 Counting Principles · Exercise 42
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