Answer: Option C
![a_n=3(6)^(n-1)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/76ohqe6h30ea1lemr4rlsmmntsl11oy1le.png)
Explanation:
The number of rabbits in each generation can be modeled using a geometric sequence of the form:
![a_n=a_1(r)^(n-1)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6v3rfhe5z7jrml57fnstj1iac4v6g2j3cw.png)
Where
is the first term of the sequence,
is the ninth term of the series, r is the common ratio
To find the proportion we divide the consecutive terms of the sequence as shown
![(18)/(3)=6\\\\(108)/(18)=6](https://img.qammunity.org/2020/formulas/mathematics/middle-school/vg9adsi5opbnaguft6c8xidjjy9kzaud0r.png)
Then the common ratio is:
![r=6](https://img.qammunity.org/2020/formulas/mathematics/middle-school/9xmhiwry1uhgozmav789fobppsf8gd3iq8.png)
The first term of the series is:
![a_1=3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5ikd9518nsr7ms5v8n44hchqfc9g1orndd.png)
Then the explicit formula is:
![a_n=3(6)^(n-1)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/76ohqe6h30ea1lemr4rlsmmntsl11oy1le.png)
The answer is: Option C