What is the explicit rule for this geometric sequence?

2, 6, 18, 54, …2, 6, 18, 54, …

an=2⋅3nan=2·3n

an=3⋅2n−1an=3·2n-1

an=2⋅3n−1an=2·3n-1

an=3⋅2n

Hello, sorry this is a little late, but hopefully it can help others who visit this question.

I believe the answer would best be an = 2 * 3^n-1 .

I can confirm that is 100% correct :)

Hope this helps, and have a great rest of your day!