Which two sets are equal?
Answer and explanation
Correct answer: A = {1, 2, 3}, B = {3, 2, 1}
Two sets are equal when they contain exactly the same distinct elements; the order of listing does not matter. A and B in option A both contain 1, 2, and 3, so they are equal. Option B differs by 4 instead of 3. Option C has the additional element 3, and option D contains different elements. Thus only A satisfies set equality.
Frequently asked questions
What is the correct answer to this question?
A = {1, 2, 3}, B = {3, 2, 1}
Why is this the correct answer?
Two sets are equal when they contain exactly the same distinct elements; the order of listing does not matter. A and B in option A both contain 1, 2, and 3, so they are equal. Option B differs by 4 instead of 3. Option C has the additional element 3, and option D contains different elements. Thus only A satisfies set equality.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Common Questions.
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