Answer variants:
b,s
φ
b,b,b,s,s,b,s,s
If \(A\) \(=\) \(\{b, s\}\) and \(B\) \(=\) \(\phi\), then find.
 
(i) \(B \times A\) \(=\)
.
 
(ii) \(A \times A\) \(=\)
.