10. If A and B are two disjoint sets such that n(AXB)=35 and
(3, 5) E (A XB) and (7,4) E (B X A), then find n(AUB)
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n(AUB)=12
given that, n(A×B)=35
(3, 5) E (A×B), (7, 4) E (B×A)
there fore, n(A)=5, n(B)=7
so n(AUB)=12
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