Answer:
16400
Explanation:
This is a geometric series with r = 3. First, find what term
10935
is.
5
⋅
(
3
n
−
1
)
=
10935
(
3
n
−
1
)
=
2187
3
n
−
1
=
3
7
n
−
1
=
7
n
=
8
Now use the formula for the sum of the first
n
terms of a geometric series:
S
n
=
a
1
(
1
−
r
n
)
1
−
r
S
8
=
5
(
1
−
3
8
)
1
−
3
=
16400
