Q57. Which of the following sets does not have a proper subset?Mathematics — Sets, Functions and Groups — Question 57 of 232A. {x : x ∈ Q}B. {x : x ∈ N, 3C. {x : x ∈ Q, 3D. {∅}Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →