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Maths Fundamental of Mathematics General Single Correct MCQ
Published on: August 13, 2026

Let A 1 , A 2 and A 3 be subsets of a set X. Which one of the following is correct ?

A
A 1 ∪ A 2 ∪ A 3 is the smallest subset of X containing elements of each of A 1 , A 2 and A 3
B
A 1 ∪ A 2 ∪ A 3 is the smallest subset of X containing either A 1 or A 2 ∪ A 3 but not both
C
The smallest subset of X containing A 1 ∪ A 2 and A 3 equals the smallest subset of X containing both A 1 and A 2 ∪ A 3 only if A 2 = A 3
D
None of these

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The correct answer is:
A

A 1 ∪ A 2 ∪ A 3 is the smallest element containing subset of all we set A 1 , A 2 and A 3

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