[Solved] Write out all functions f:{1,2}{a,b,c,d}

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Write out all functions f:{1,2}{a,b,c,d} (in two-line notation). How many functions are there? How many are surjective? How many are injective? How many are bijective

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Write out all functions f:{1,2}{a,b,c,d} (in two-line notation). How many functions are there? How many are surjective? How many are injective? How many are bijective

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