Question

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

2, 6, 18, 54, ...


an = 3(2)n-1

an = 2(3)n-1

an = 2(4)n-1

Answer 1

I think its an = 2(3)n-1

Answer 2

yep first term is a = 2, common ratio is r = 3

Answer 3

I'm assuming you mean
\[\Large a_n = 2(3)^{n-1}\]