Hello! Please show how to solve this question! I don't know how to solve the second part of the question...
In a geometric progression, the first term is 12, and the fourth term is (-3/2).
i)Find the sum of the first n terms of the progression, Sn.
ii) Find the sum to infinity, S, of the progression [I found this to be 8] and the least value of n for which the magnitude of the difference between Sn and S is less than 0.001.
Thank you very much!!