Question

Find A × B, A × A and B × A:

A = {m, n}; B = Φ

Answer 1

A = {m, n}; B = Φ

Note: B = Φ or { }

A × B = {m, n} × { }

= { }

A × A = {(m, n) × (m, n)}

= {(m, m) (m, n) (n, m) (n, n)}

B × A = { } × {m, n}

= { }