Question

Which formula describes the following geometric sequence? Remember that n represents the term number.

2, 6, 18, 54, ...

A. an = 2 · 3n - 1
B. an = 3 · 2n - 1
C. an = 2 + 3(n - 1)
D. an = 3 + 2(n - 1)

Answer 1

a

Explanation:

Answer 2

The formula on nth term is l=ar^(n-1)
The 1st term is 2 & r,the ration =3

Then is 2x3^(n-1). Mind you (n-1) is an exponent on 3