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Let U = {1,2,3,4,5,6,7,8,9,10,11}, A = {1,3,5,7,9}, and B = {2,3,5,8,11}. What is A ∪ B?
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Answer and explanation
Correct answer: {1,2,3,5,7,8,9,11}
The union A ∪ B contains every distinct element that appears in A or in B. Combining A and B gives 1, 2, 3, 5, 7, 8, 9, and 11. The repeated elements 3 and 5 are written only once, because a set does not list duplicate elements. Therefore, option B is correct.
Frequently asked questions
What is the correct answer to this question?
{1,2,3,5,7,8,9,11}
Why is this the correct answer?
The union A ∪ B contains every distinct element that appears in A or in B. Combining A and B gives 1, 2, 3, 5, 7, 8, 9, and 11. The repeated elements 3 and 5 are written only once, because a set does not list duplicate elements. Therefore, option B is correct.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Sets.
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