If $A=\{1,2,3,4,5\}$ and $\mathrm{B}=\{0,2,4,6,8\}$ then $\mathrm{n}((\mathrm{A} imes \mathrm{B})

Question

If $A=\{1,2,3,4,5\}$ and $\mathrm{B}=\{0,2,4,6,8\}$ then $\mathrm{n}((\mathrm{A} 	imes \mathrm{B}) \cap(\mathrm{B} 	imes \mathrm{A}))$ is

Professor PC Thomas Classes · Answer

$A \cap B=\{2,4\}$\ $n((A 	imes B) \cap(B 	imes A))=n((A \cap B) 	imes(B \cap A))=4$