(11) Which of the following functions f: Z x Z Z is injective (A) f(1,y) = 1/y (B) f(x,y) = x+y (C) f(x,y) = xy (D) None (12) Which of the followingis true, where z any y are real numbers (A) [z+ y] = [z]+ [v] (B) [z y] = [=] [v] (C) [5x) = 5 [a] (D) None (13) Compute (173

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