Question

Find the sum of the first five terms of the geometric series 50 + 25 + 12.5 + …...........

Answer 1

Answer: All I know is that the answer to 50 + 25 +12.5, which is 87.5. If it didn't help you or at least a little, I don't know what else to say.

Answer 2

The sequence is geometric with first term

The ratio of successive term and proceeding term is constant (r=0.5) . Therefore the sequence is geometric whose first term is a 1 = 100 and common ratio is r= 0.5 [Ans]