Question: Ex 5 Let X , Y be nite nonempty sets with m and n elements respectively. How many functions are there from X to Y?

Ex 5 Let X , Y be nite nonempty sets with m and n elements respectively. How many functions are there from X to Y? How many injections? How many bijections? Hint: First do simple cases for m, n = 1, 2, 3 and then generalize your formulas. Remember to explain how you get your

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