<PRE><B>Question 205807</B>
use the union rule to answer the question
If n(a)=40,n (b) =117,and n (a u b)= 137 what is n (A n B)
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(A n B) = A + B - (A u B)
(A n B) = 40 + 117 - 137 = 20
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Cheers,
Stan H.
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A.60
B.20
C.10
D.22


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