Question

Can someone help with this?

Answer 1

Answer is b

Explanation:

Because geometric sequence has the formula as
`a_n=a_0r^(n-1)` where `a_0` is the first term and `r` is the ratio.

In our case `a_0=1`

r is the ratio which can be obtained `a_2/a_1=3` and in general

`a_n/a_(n-1)=r` So in your question it is 3/1So r=3
While n is the number of term
If they would have said T9
This means n=9
Thus your term is `a_n=1*3^(n-1)`