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Let a1, a2, ..., an be a permutation of {1, 2,..., n}. Define Ordinal Number of a; as the num- ber of numbers which
Let a1, a2, ..., an be a permutation of {1, 2,..., n}. Define Ordinal Number of a; as the num- ber of numbers which are smaller than ai and on ai's left. How many ways are there to arrange {1, 2,..., 9} such that the Ordinal Number of 9, 8, and 6 are 2, 3, and 3 respectively?
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Introduction to graph theory
Authors: Douglas B. West
2nd edition
131437372, 978-0131437371
