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Suppose f:XY is a function. Which of the following are possible? Explain. a. f is injective but not surjective. b. f is surjective but not

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Suppose f:XY is a function. Which of the following are possible? Explain. a. f is injective but not surjective. b. f is surjective but not injective. c. X=Y and f is injective but not surjective. d. X=Y and f is surjective but not injective. e. X=Y,X and Y are finite, and f is injective but not surjective. f. X=Y,X and Y are finite, and f is surjective but not injective

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