If A = {1, 2, 3} and B = {4, 5}, what is A ∪ B?
Answer and explanation
Correct answer: {1, 2, 3, 4, 5}
The union A ∪ B is formed by collecting every element from A and every element from B, without repeating any element. Here A contributes 1, 2, and 3, while B contributes 4 and 5. Since the sets are disjoint, none of these elements is repeated or removed. Therefore, A ∪ B = {1, 2, 3, 4, 5}. Option A is correct.
Frequently asked questions
What is the correct answer to this question?
{1, 2, 3, 4, 5}
Why is this the correct answer?
The union A ∪ B is formed by collecting every element from A and every element from B, without repeating any element. Here A contributes 1, 2, and 3, while B contributes 4 and 5. Since the sets are disjoint, none of these elements is repeated or removed. Therefore, A ∪ B = {1, 2, 3, 4, 5}. Option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Sets. Topic: Operations on Sets (Union, Intersection, Difference).
