Question

using geometric series to find the answer S = 45450, r = 3.6, n = 6

Answer 1

well the sum of a geometric series is

\[S_{n} = \frac{a(1 - r^n)}{1 - r}\]

you know S, r and n

so I suppose you are solving for a

so making a, the 1st term, the subject you get

\[a = \frac{S_{n} \times (1 -r)}{1 - r^n}\]

I'd substitute and evaluate

Answer 2

Thank you.