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Let A  and W  be sets. Suppose n(A′)=17, n(W)=12  , n(A′∪W′)=25 and n(A∩W)=3. What is n(U)

 Dec 6, 2018
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U=(AW)(AW)(AW)(AW)=|U|=|(AW)|+|(AW)||AW|=3|(AW)|=|(AW)|=25|U|=3+25=28

 

as far as I can see the other details aren't needed.

 Dec 6, 2018

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