Question

Find the summation of the finite geometric series below.
(It should equal 3.75)

Answer 1

\[\sum_{i = 1}^{10}5(\frac{ -1 }{ 3 })^{i-1}\]

Answer 2

Through the equation, I keep getting 1.5

Answer 3

In this case, the first term is a = 5 and the common ratio is r = -1/3

Answer 4

you would then plug these values into the nth partial sum formula

\[\Large S_n = a\left(\frac{1-r^n}{1-r}\right)\]

Answer 5

oh and in this case, n = 10 since you want the 10th partial sum

Answer 6

I got it now, thanks.

Answer 7

np

Answer 8

I think I was multiplying it by 2 for some reason