Answer :

To prove:


Given: a, b, c are in GP


Formula used: When a,b,c are in GP, b2 = ac


a, b, c are in GP,


b2 = ac … (i)


… (ii)


Taking LHS =


Substituting the value b2 = ac from eqn. (i)


LHS =




Substituting the value b = from eqn. (ii)




Multiplying and dividing with




= RHS


Hence Proved


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