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Solution
Given = $$P:Q=9:7$$
Let $$P=9$$ and $$Q=7$$
To find = $$\frac{P-Q}{P+Q}$$
=Â $$\frac{9-7}{9+7}$$
= $$\frac{2}{16}=\frac{1}{8}$$
$$\therefore$$ Required ratio = $$1:8$$
=> Ans - (B)
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