Concept explainers
In Exercises 45-72, use permutations, combinations, the fundamental counting principle, or other counting methods, as appropriate.
Sums of Digits How many counting numbers consist of four distinct nonzero digits such that the sum of the four digits is the given number?
(a) 12
(b) 13
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Mathematical Ideas with Integrated Review and Worksheets plus NEW MyLab Math with Pearson eText -- Access Card Package (Integrated Review Courses in MyLab Math and MyLab Statistics)
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