Hi,

In a geometric sequence the sum of the 2nd and 3rd terms is 12 

and the sum of the 3rd and 4th terms is 60. 

Geometric sequence

 

 

      

             

Question states***

   0r  

 0r     



           r = 5   and 

CHECKING our answer***

  2 + (2/5)25 = 12 

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