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

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If 3rd, 4th, 5th and 6th terms in the expansion of be $(\text{x}+\text{a})^{\text{n}}$ respectively a, b, c and d. prove that $\frac{\text{b}^{2}-\text{ac}}{\text{c}^{2}-\text{bd}}=\frac{5\text{a}}{3\text{c}}.$