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Permutation Position In Sorted List

1300ApprenticePermutationsCombinatoricsCounting Principles
Pedrinho makes a list of all five-digit numbers with distinct digits formed from the digits $1,2,3,4,5$. In this list the numbers are ordered in increasing order. a) Which number occupies the 10th position in the list? b) Which number occupies the 85th position in the list?
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