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  3. 3 let a and b be nonempty finite sets with...

Question: 3 let a and b be nonempty finite sets with...

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(3) Let A and B be non-empty finite sets with A-(ah42, ,a,.) and B-(h, b2 ,bm). (a) How many functions are there f: A B? Justify your response by referring to strings (b) For n 2 m how many injective functions are there f: A B? Justify your response by referring to strings (c) For m 2 how many bijections are there f : A → B? Justify your response by referring to strings

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