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If the system of equtions px+by+cz=0, ax...

If the system of equtions `px+by+cz=0, ax+qy+cz=0, ax+by+rz=0` has a non - trivial solution and `pneq, qnebb, r nec`, prove that `(p)/(p-a)+(q)/(q-b)+(r)/(r-c)=2`.

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