Multiple choice general knowledge math & puzzles

A = {1,2,3,4}, B = {3,5,6,7}, C = {1,3,7,8} Find: (A U B) n C

  1. {1,3,7}

  2. {2,4,6}

  3. {1,2,3,4,6,7}

  4. {8}
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A Correct answer
Explanation

First find A U B = {1,2,3,4,5,6,7}, then intersect with C = {1,3,7,8}. The common elements between these sets are 1, 3, and 7, giving the result {1,3,7}. Union combines all unique elements from sets, intersection keeps only common elements.

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