If n ( A ) = 12 , n ( B ) = 15 and n(A∩ B) = 3 then n(A ∪ B ) =
27
18
30
24
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If n ( A ) = 12 , n ( B ) = 15 and n(A∩ B) = 3 then n(A ∪ B ) =
27
18
30
24
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