The Solution.
The Rule is:
Subtract 8 to get the next term, and then add 4 to get the next term, and keep repeating this process.
So, the next three terms are:
![\begin{gathered} 20-8=12 \\ \text{The first is 12} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/yvq4hrlob4eh9d8sprioe06axrli0pjq89.png)
The next term will be:
![\begin{gathered} 12+4=16 \\ \text{The second term is 16} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/u1g3ieslesvny4vwks8g30agb05s1ghns5.png)
The next term will be:
![\begin{gathered} 16-8=8 \\ \text{The third term is 8} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/vfs1biqjl1v7cv73zu8dnm1nrr514kqgjp.png)
Hence, the next three terms are 12, 16, and 8.