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(i)If n(A)=25, n(B)=40, n(A cup B)=50 an...

(i)If n(A)=25, n(B)=40, `n(A cup B)=50 and n(B')=25," find "n(A cap B) and n(U)`.
(ii) If `n(A)=300, n(A cup B)=500, n(A cap B)=50 and n (B')=350`, find `n(B) and n(U)`.

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