Question
If A = {1, 2, 4} and B = {1, 2, 3}, represent following sets graphically:
B × B
B × B

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$\left|\begin{array}{ccc}1 & 4 & 20 \\ 1 & -2 & -5 \\ 1 & 2 x & 5 x^2\end{array}\right|=0$