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Weekend combinatorics (II)

Summary:
How many permutations exist of the ten digits (0-9) that either begin with”123″, contain “56” in the 6th & 7th positions, or end with “789”?

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Weekend combinatorics (II)

How many permutations exist of the ten digits (0-9) that either begin with”123″, contain “56” in the 6th & 7th positions, or end with “789”?

Lars Pålsson Syll
Professor at Malmö University. Primary research interest - the philosophy, history and methodology of economics.

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