Question

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)​

Answer 1

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