If A = {1, 3, 5} and B = {1, 2, 3, 4, 5}, what is B − A?
Answer and explanation
Correct answer: {2, 4}
To find B − A, start with the elements of B and remove every element that also occurs in A. B contains {1, 2, 3, 4, 5}, while A contains 1, 3, and 5. Removing those three elements leaves 2 and 4. Therefore, B − A = {2, 4}. Option A is A itself, and option D would be correct only if A contained every element of B.
Frequently asked questions
What is the correct answer to this question?
{2, 4}
Why is this the correct answer?
To find B − A, start with the elements of B and remove every element that also occurs in A. B contains {1, 2, 3, 4, 5}, while A contains 1, 3, and 5. Removing those three elements leaves 2 and 4. Therefore, B − A = {2, 4}. Option A is A itself, and option D would be correct only if A contained every element of B.
Which subject and chapter does this question cover?
This is a Class 12 Mathematics question. Chapter: Sets.
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