WAEC - Mathematics (2022 - No. 3)

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

15

17

20

23

解释

n(AuB) = n(A) + n(B) - n(AnB)

n(AuB) = 8 + 12 - 3

= 17

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