Question

Let A = {1,2,3,4 } , B = {3,4,5,6,7} then what is the value of n[(A X B) Ո (B X A)]​

Answer 1

Answer:

A × B = {(1,3),(1,4),(1,5),(1,6),(1,7),(2,3),(2,4),(2,5),(2,6),(2,7),(3,3),(3,4),(3,5),(3,6),(3,7),(4,3),(4,4),(4,5),(4,6),(4,7)}

B × A = {(3,1),(3,2),(3,3),(3,4),(4,1),(4,2),4,3),(4,4),(5,1),(5,2),(5,3),(5,4),(6,1),(6,2),(6,3),(6,4),(7,1),(7,2),(7,3),(7,4)}

(A × B) Ո (B × A) = {(3,3), (4,4)}

n[(A × B) Ո (B × A) ] = 2