Solution
Given : $$\ (x/y)^{5a-3}\ $$ =$$\ (y/x)^{17-3a}$$
=> $$\ (x/y)^{5a-3}\ =\ (x/y)^{3a-17}$$
=> $$5a-3=3a-17$$
=> $$5a-3a=-17+3$$
=> $$2a=-14$$
=> $$a=\frac{-14}{2}=-7$$
=> Ans - (A)
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