MCQ practice · SSC General Mathematics Board questions · Chapter 2: Sets and Functions
If A = {2, 3, 4} and B = {3, 4, 5}, what is A \ B?
Think it through first, then pick an option.
- a {2}
- b {5}
- c {3, 4}
- d {2, 3, 4, 5}
Answer and explanation
Correct answer: a {2}
The only element of A that is not in B is 2.
Why the other options are wrong
- b {5}: This is B \ A; the removal was made from the wrong side.
- c {3, 4}: This is A ∩ B, the common elements; not the difference.
- d {2, 3, 4, 5}: This is A ∪ B, everyone together; not the difference.
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