17. If the terms of a G.P. are x, y and z, respectively. Prove that x,y, z are in G.P.
Let x,y, z are in G.P.
Let first term=a and common ratio = r
Dividing equation 2 by 1, we have
Dividing equation 3 by 2, we have
Equating values of , we have
Thus, x,y,z are in GP
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