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

an = 2(3)n-1

Answer 2

C. an = 2 (3)^(n-1)