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25. (2.3 Functions) Which of the following functions from Z to Z is NOT one-to-one? a. f(n) = n-1 b. f(n) = n c. f(n)
25. (2.3 Functions) Which of the following functions from Z to Z is NOT one-to-one? a. f(n) = n-1 b. f(n) = n c. f(n) = n2+1 d. f(n) = -3n+ 4
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