If n () = 40, n (A)=25, n (B)= 12 & n( ∪ ) ′ = 8. Find ( − ).
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The symbol "i" is only allowed in complex arithmetic, for example:
(3/5+7i)+(0.3-7.002i)
(5+77i)-(19/4-8i)
(240-22i)*(247/7+2.222i)
(33/5+99i)/(33/5-88i)
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