If |A|=16, |B|=27, and |A ∩ B|=6, how many elements are only in A?

Question: If |A|=16, |B|=27, and |A ∩ B|=6, how many elements are only in A?

  1. 10
  2. 11
  3. 9
  4. 12

Correct Answer: A — 10

Explanation: Subtract the elements shared by both sets from |A|.
Using the values in this question gives 10 as the correct answer.

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