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jwodub

  • 2 years ago

n(A)=10, n(AB)=3, and n(A U B)=19, what is n(B)?

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  1. sourwing
    • 2 years ago
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    N(A or B) = N(A) + N(B) - N(A and B)

  2. sleung
    • 2 years ago
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    So you have 19=10+N(B)-3, and you get N(B)=12.

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