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If n{A} = 6, n{B} = 5 and n{A ∩ B} = 2, find n{A...

Mathematics
NECO 2001

If n{A} = 6, n{B} = 5 and n{A ∩ B} = 2, find n{A ∪ B}

  • A. 7
  • B. 8
  • C. 9
  • D. 13
  • E. 15
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Correct Answer: Option C
Explanation

n(A U B) = n(A) + n(B) - n(A n B)

n(A U B) = 6 + 5 - 2 = 9

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