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Which of the following functions from Z to Z is NOT one-to-one? n-1 a. f(n) b. f(n) = n c. f(n) n+1 d. f(n)

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Which of the following functions from Z to Z is NOT one-to-one? n-1 a. f(n) b. f(n) = n c. f(n) n+1 d. f(n) 3n+4

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