Let \( U \) be the universal set containing 700 elements. If \( A, ...

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Let \( U \) be the universal set containing 700 elements. If \( A, B \) are sub-sets of \( U \) such that \( n(A)=200, n(B)=300 \) and
(IV) \( n(A \cap B)=100 \). Then \( n\left(A^{\prime} \cap B^{\prime}\right)= \)
(a) 400
(b) 600
(c) 300
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