Question: Problem H-304. (a) How many surjective (onto) functions f : [6] -> [4] are there? (b) How many injective (one-to-one) functions f : [4] -

Problem H-304. (a) How many surjective (onto) functions f : [6] -> [4] are there? (b) How many injective (one-to-one) functions f : [4] - [6] are there? Hint: f(1), f(2), f(3), f(4) are all different, so they form a partial permutation

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