Consider the following in respect of sets A and B: 1 .(A-B)\cupB=A 2.(A-B)\cupA=A 3. (𝐴−𝐵)\cap𝐵=ϕ 4. A\subseteqB\RightarrowA\cupB=B Which of the above are correct? [NDA I 2017]

UPSC NDA I 2017 Mathematics Solved Paper

Question : 8 of 120

Marks: +1, -0

Consider the following in respect of sets A and B:
1 .(A−B)∪B=A
2.‌(A−B)∪A=A
3. (𝐴−𝐵)∩𝐵=ϕ
4. A⊆B⇒A∪B=B
Which of the above are correct?

[NDA I 2017]

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