Answer :
Given: a,b,c are in AP and x,y,z are in GP.
⇒ 
⇒ 2b = a+c and y2 = xz.
⇒ 
L.H.S = xb-c.yc-a.za-b
⇒ 
⇒ 
⇒ 
⇒ 
⇒1.1
⇒ 1.
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