Ononot — How many functions f: \{1, 2, 3, 4\} \to \{1, 2, 3, 4, 5, 6\

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Combinatoricshard

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How many functions $f: \{1, 2, 3, 4\} \to \{1, 2, 3, 4, 5, 6\}$ are injective?