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Two circle $S_1=p x^2+p y^2+2 g^{\prime} x+2 f^{\prime} y+d=0$ and $S_2=x^2+y^2+2 g x+2 f y+d^{\prime}=0$ have a common chord $P Q$. The equation of $\mathrm{PQ}$ is
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The correct answer is:
$\mathrm{S}_1-\mathrm{pS}_2=0$
$\frac{\mathrm{S}_1}{\mathrm{p}}-\mathrm{S}_2=0 \Rightarrow \mathrm{S}_1-\mathrm{pS}_2=0$
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