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Given that A and B are sets such that n(A) = 8, n(B)=12 and n(AnB)...

Mathematics
WAEC 2022

Given that A and B are sets such that n(A) = 8, n(B)=12 and n(AnB) =3, find n(AuB).

  • A. 15
  • B. 17
  • C. 20
  • D. 23
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Correct Answer: Option B
Explanation

n(AuB) = n(A) + n(B) -  n(AnB)

n(AuB) = 8 + 12 - 3

= 17 

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