Question

if A ={4,5,6}and B=(3,5,7)find n (A)​

Answer 1

Answer:

A×B={(a,b)|a∈A,b∈B}

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

n(A×B)=n(A)×n(B)=6×4=24