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Given the sets A = {1, 2, 5} and B = {3, 4, 5, 9}, what is A ∩ B?

1. {1, 2, 5, 9}
2. {1, 2, 3, 4, 9}
3. {1, 2, 3, 4, 5, 9}
4. None of these

Correct answer: None of these

Solution

The intersection contains only elements common to both sets. A = {1,2,5} and B = {3,4,5,9} share only 5, so A intersect B = {5}. Since {5} is not among the options, the answer is 'None of these'.

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