Let \( X \) be the universal set for sets \( A \) and \( B \), if \...

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Let \( X \) be the universal set for sets \( A \) and \( B \), if \( n(A)=200 \), \( n(B)=300 \) and \( n(A \cap B)=100 \), then \( n\left(A^{\prime} \cap B^{\prime}\right) \) is equal to
P 300 provided \( n(X) \) is equal to

W
(a) 600
(b) 700
(c) 800
(d) 900
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