Răspuns :
Răspuns:
card B = 4
Explicație pas cu pas:
card A=3 => A = {1 ; 2 ; 3}
card A×B=12 =>
AxB = {(1,a) ; (2,a) ; (3,a) ; (1,b) ; (2,b) ; (3,b) ; (1,c) ; (2,c) ; (3,c) ; (1,d) ; (2,d) ; (3,d)}
=> B = {a,b,c,d} => card B = 4
Răspuns:
card B = 4
Explicație pas cu pas:
card A=3 => A = {1 ; 2 ; 3}
card A×B=12 =>
AxB = {(1,a) ; (2,a) ; (3,a) ; (1,b) ; (2,b) ; (3,b) ; (1,c) ; (2,c) ; (3,c) ; (1,d) ; (2,d) ; (3,d)}
=> B = {a,b,c,d} => card B = 4