If the pth,qth and rth term of an A.P. is x,y and z respectively,Show that x(q-r)+y(r-p)+z(p-q)=0

If the pth,qth and rth term of an A.P. is x,y and z respectively,Show

1.	If the pth,qth and rth term of an A.P. is x,y and z respectively,Show that x(q-r)+y(r-p)+z(p-q)=0
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