IF x ,y.z are the pth  ,qth are rth term of an A.P... then show that - x(q-r)+y(r-p)+z(p-q) = 0

IF x ,y.z are the pth ,qth are rth term of an A.P... then show that - x(q-r)+y(r-p)+z(p-q) = 0

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