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
waec 2022mathematics

The correct answer is B. 17

n(AuB) = n(A) + n(B) -  n(AnB)

n(AuB) = 8 + 12 - 3

= 17

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