Let A = {–1, 2, 3} and B = {1, 3}. Determine
(i) A × B
(ii) B × A
(iii) B × B
(iv) A × A
According to the question,
A = {–1, 2, 3} and B = {1, 3}
(i) A × B
{–1, 2, 3} × {1, 3}
So, A × B = {(–1, 1), (–1, 3), (2, 1), (2, 3), (3, 1), (3, 3)}
Hence, the Cartesian product = {(–1, 1), (–1, 3), (2, 1), (2, 3), (3, 1), (3, 3)}
(ii) B × A.
{1, 3} × {–1, 2, 3}
So, B × A = {(1, –1), (1, 2), (1, 3), (3, –1), (3, 2), (3, 3)}
Hence, the Cartesian product = {(1, –1), (1, 2), (1, 3), (3, –1), (3, 2), (3, 3)}
(iii) B × B
{1, 3} ×{1, 3}
So, B × B = {(1, 1), (1, 3), (3, 1), (3, 3)}
Hence, the Cartesian product = {(1, 1), (1, 3), (3, 1), (3, 3)}
(iv) A × A
{–1, 2, 3} × {–1, 2, 3}
So, A × A = {(–1, –1), (–1, 2), (–1, 3), (2, –1), (2, 2), (2, 3), (3, –1), (3, 2), (3, 3)}
Hence,
the Cartesian product ={(–1, –1), (–1, 2), (–1, 3), (2, –1), (2, 2), (2, 3), (3, –1), (3, 2), (3, 3)}