If A equals left curly bracket 1 comma space left curly bracket 2 comma space 3 right curly bracket right curly bracketand B equals left curly bracket empty set comma space left curly bracket empty set right curly bracket comma space left curly bracket left curly bracket empty set right curly bracket right curly bracket right curly bracket, how many elements are in the cartesian product A cross times P left parenthesis B right parenthesis where P left parenthesis B right parenthesis is the power set of B?
