If the fourth term in the Binomial expansion of $\left( \frac { 2 } { x } + x ^ { \log _ { 8 } x } \right) ^ { 6 } , ( x > 0 )$ is $20 \times 8 ^ { 7 }$, then a value of $x$ is (1) $8 ^ { - 2 }$ (2) 8 (3) $8 ^ { 3 }$ (4) $8 ^ { 2 }$
If the fourth term in the Binomial expansion of $\left( \frac { 2 } { x } + x ^ { \log _ { 8 } x } \right) ^ { 6 } , ( x > 0 )$ is $20 \times 8 ^ { 7 }$, then a value of $x$ is\\
(1) $8 ^ { - 2 }$\\
(2) 8\\
(3) $8 ^ { 3 }$\\
(4) $8 ^ { 2 }$