Given that the arithmetic sequence $\left\{ a _ { n } \right\}$ satisfies $a _ { 1 } + a _ { 2 } = 10$ and $a _ { 4 } - a _ { 3 } = 2$.\n(I) Find the general term formula of $\left\{ a _ { n } \right\}$;\n(II) Let the geometric sequence $\left\{ b _ { n } \right\}$ satisfy $b _ { 2 } = a _ { 3 }$ and $b _ { 3 } = a _ { 7 }$. Question: Which term of the sequence $\left\{ a _ { n } \right\}$ is equal to $b _ { 6 }$?