Jika n(A)= 10, n(B)= 8, dan n(A ∩ B)= 8, maka nilai n(A ∪ B) adalah ….

Materi : Himpunan

n(A) = a

n(B) = b

n( A ∩ B ) = n

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( a – n ) + ( b – n ) + n = A ∪ B

( 10 – 8 ) + ( 8 – 8 ) + 8 = A ∪ B

2 + 0 + 8 = A ∪ B

10 [ c. ] = A ∪ B

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