Question

Find S20 for the geometric series 4 + 12 + 36 + 108 + …

Answer 1

its a GP with
a=4
r=3
n=20
for sum,,formulla is a(r^n -1)/(r-1)
just make these substitutions.

Answer 2

is it 6,973,568,800

Answer 3

thats not a answer choice

Answer 4

put a=4
r=3
n=20

Answer 5

your calculation is correct

Answer 6

thanksss