Find the n(U) and n(A ∩ B) — task. Mathematics State Board, Class 9.

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If $n (A) =$ 25, $n (B) =$ 40, $n (A \cup B) =$ 50, and $n (B^{'}) =$ 25. Then $n(U) =$ , and $n(A∩B) =$ .

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3. Find the n(U) and n(A ∩ B)