defence exam INET Mock Test Quantitative Aptitude Algebra Linear Equation in 2 or more Variables

If \(ab = \frac{c}{d}\) and \(cd = \frac{a}{b}\), then which of the following is TRUE?

1
a2 + b2 = 0
2
a2b2 = 1
3
b2d2 = 1
4
b = d
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