Q. 175.0( 2 Votes )

If are three consecutive terms of an A.P., prove that a, b, c are the three consecutive terms of a G.P.

Answer :

Given are in AP.


{taking arithmetic mean – to get the relationship}



ab + ac + b2 + bc = b2 + bc + ab + b2


b2 = ac


We know if a,b,c are consecutive terms of GP then b2 = ac holds.


a,b,c are in GP.


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