Multiple choice general knowledge math & puzzles

A= {2,5,9}, B= { } Find: A n B

  1. { }

  2. {2,5,9}

  3. {5}

  4. {9}
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A Correct answer
Explanation

The intersection of any set with the empty set is always empty. Set B = { } (empty set), so A n B = { } because there are no common elements. This is a fundamental property of set operations.

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