If A = {1,2,3,6} and B = {2,4,5,7} then B - A = _____?
- {1,3,6}
- {2}
- {4,5,7}
- None of these
Explanation
To find B - A, we look for elements that are in B but not in A.
A = {1,2,3,6}
B = {2,4,5,7}
Elements in B: 2, 4, 5, 7
Remove elements that are also in A: 2 is in A, so remove it.
Remaining elements in B: 4, 5, 7
∴ B - A = {4,5,7}
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