Math Chapter Wise Sets, Relations And Functions English MCQ UKPSC Lecturer (Mains) 2020 Q.Which of the following functions is surjective? Af: R → R defined by f (x) = x2 Bf: R+ → R defined by f (x) = x2 Cf: R+ → R defined by f (x) = x2 Df: R+ → R defined by f (x) = x Show answer Correct answer: f: R+ → R defined by f (x) = x2