Question

If set C is {1, 2, 3, 4} and C – D = Φ then set D can be ___________

(a) {1, 2, 4, 5}

(b) {1, 2, 3}

(c) {1, 2, 3, 4, 5}

(d) None of the mentioned

I got this question during an interview.

Query is from Algebraic Laws on Sets in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Answer 1

Right option is (c) {1, 2, 3, 4, 5}

Easy explanation: C ∩ D should be equivalent to C for C – D = Φ.