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Given A=[[p,b,c],[a,q,c],[a,b,r]]. If de...

Given `A=[[p,b,c],[a,q,c],[a,b,r]]`. If `det(A)=0` and `a!=p,b!=q,c!=q`, then prove `p/(p-a)+q/(q-b)+r/(r-c)=2`.

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