Please help me on #8 I don’t know what I did wrong

Okay, here we have this:
Considering the provided sequence, we obtain that:
Since the function does not have a constant difference or ratio, it is not an arithmetic or geometric sequence, then: All the terms in odd position are 6, and the terms in even position are equal to 8, this can be represented as follows:
[tex]a_n=\begin{cases}6ifn(\mod )2==1 \\ 8if\text{ n(mod)2==0}\end{cases}\text{ }[/tex]