Question

Which of the following is the formula for the geometric sequence?

2, 6, 18, 54, ...
A. an = 3(2)n-1
B. an = 2(4)n-1
C. an = 2(3)n-1

Answer 1

C

Answer 2

A. \[a _{n}= 3(2)^{n-1}\]

B. \[a _{n}= 2(4)^{n-1}\]

C. \[a _{n}=2(3) ^{n-1}\]