Unformatted text preview: and 3? 3 How many permutations of [ n ] are there in which at least one of the Frst two entries is even? 4 How many permutations of [ n ] contain exactly one cycle of length 1? 5 ±ind an explicit formula for a n if a = 1 and a n +1 = 3 a n + 2 n for all n ≥ 0....
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 Fall '10
 Vetter
 Natural number, Prime number, twodigit positive integers

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