Math Chapter Wise Limit, Continuity And Differentiability Of Function Of One Variable English MCQ UP PCS (Pre) 1994 Q.The function 1, irrational (x) 1, rational x f x is– ADiscontinuous at x = 0 only BDiscontinuous at rationales only CDiscontinuous at irrationals only DNone of these Show answer Correct answer: Discontinuous at x = 0 only