If A = (2, 4, 5, 7) and B = (3, 4, 7), then BA is?
- {3}
- {2, 5}
- {3, 4, 7}
- None of these
Explanation
Set Difference (B A) means the elements in B that are not in A.
Given:
A = {2, 4, 5, 7}
B = {3, 4, 7}
Elements of B are {3, 4, 7}.
4 and 7 are also in A, so they are removed.
3 is not in A, so it remains.
Therefore, B A = {3}
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