MCQ practice · SSC General Mathematics Board questions · Chapter 2: Sets and Functions
If M = {a, b, 1, 2} and N = {1, 2}, what is N − M?
Think it through first, then pick an option.
- a {a, b}
- b {0}
- c {ϕ}
- d { }
Answer and explanation
Correct answer: d { }
Both 1 and 2 of N are in M, so nothing is left: the empty set { }.
Why the other options are wrong
- a {a, b}: This is M − N; the question removes M from N.
- b {0}: {0} has an element 0, but a difference never brings in new elements.
- c {ϕ}: {ϕ} has one element; the empty set has none.
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