Question

If A= { 1,2,3,4} And B = { 5,6,7 } then find cartesian product and cardinality of cartesian product .​

Answer 1

A×B=(1.5) (1.6) (1.7) (2.5) (2.6) (2.7) (3.5) (3.6) (3.7) (4.5) (4.6) (4.7)

n(A)= 4

n(B)=3

n(A×B)= 4×3

=12