If pth, qth and rth terms of an A.P. are in G.P. whose common ratio is k, then the root of equation$\left(q-r\right){x}^{2}+\left(r-p\right)x+\left(p-q\right)=0$ other than unity is : (1) k2               (2) k                 (3) 2k                (4) None of these

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