Question

Dados A={1,2,3} e B={4,5}, forme todos os pares ordenados.
a) AxB
b) BxA
c) A2 (ao quadrado)
d)B2 (ao quadrado )

Answer 1

a) A x B

A x B = {(1,4),(1,5),(2,4),(2,5),(3,4),(3,5)}

b) B x A

B x A = {(4,1),(4,2),(4,3),(5,1),(5,2),(5,3)}

c) A²

A² = A x A = {(1,1),(1,2),(1,3),(2,1),(2,2)(2,3),(3,1),(3,2),(3,3)}

d) B²

B² = B x B = {(4,4),(4,5),(5,4),(5,5)}