Question 833882
Let A = (3,4) and B =(x,y), determine n(A x B)

recall that

AxB = {(a,b) | a Î A and b Î B }; 

so, AxB = {(3,x), (3,y),(4,x),(4,y)}

and 

n(A x B)=4

or this way: 

n(A x B) = n(A) x n(B) 

In this case, n(A) = 2, n(B) = 2, n(A x B) = 2*2=4.