Number of subsets

Discrete Mathematics Level pending

Let \(a\) and \(b\) be the elements of the two sets \(A\) and \(B,\) respectively. Find the number of ordered pairs \( ( a, b ) \) when \( A\) and \( B \) satisfy the following two conditions:

\(1.\) Both \(A\) and \(B\) are subsets of the set \(\left\{1,3, 5,7,9,11\right\}. \)
\(2.\) \( A - B = \left\{ 1, 3, 5 \right\} .\)

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