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Let T be the first term of the sequence and q be the common ratio.
We have T1 = T; Tn = Tq^(n-1); T2 = Tq and T(n-1) = TQ^(n-2).
Substitute these values into the left side and into the right side, and you will get the same
expression T^2*q^(n-1) in both sides.