Answer :

4th term = ar4-1 = ar3 =


7th term = ar7-1= ar6 =


Dividing the 7th term by the 4th term,



……(i)



ar3 = [putting from eqn (i) ]


a =


a = 1


Sum of a G.P. series is represented by the formula, , when |r|<1. ‘Sn’ represents the sum of the G.P. series upto nth terms, ‘a’ represents the first term, ‘r’ represents the common ratio and ‘n’ represents the number of terms.


Here,


a = 1



n terms






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