Answer :

In this question, we will try to rewrite the given sum of the progression like the formula for the sum a G.P. series.


It is given that Sn = ( 2n – 1)


The formula for the sum of a G.P. series is,



By solving the 2 equations together, we can say that




By corresponding the numbers with the variables, we can conclude


a = 1


r = 2


The G.P. series will therefore look like 1,2,4,8,16,……to n terms


The given progression is a G.P. series with the common ration being 2.


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