Question

Which of the following is the formula for the geometric sequence?
1.2, 2.4, 4.8, 9.6,...

an = 9.6(1/2)n-1
an = 1.2(2)n-1
an = 9.6(2)n-1

Answer 1

Here is one more: Which of the following is the formula for the geometric sequence?
900, 300, 100, 33 1/3,...

an = 900(3)n-1
an = 33 1/3 (3)n-1
an = 900(1/3)n-1

Answer 2

\[a _{n}=1,2(2)^{n-1}\]
\[a _{n}=900(1/3)^{n-1}\]

Answer 3

\[a _{n}=a(r)^{n-1}\]
is the general term where a is the first term