Answer
$\frac{1}{3}$
Work Step by Step
We know that $probability=\frac{\text{number of favorable outcomes}}{\text{number of all outcomes}}$
The number of all outcomes is $6!=720$, out of these $2\cdot5!=240$ corresponds to the desirable order.
Hence here the probability is $\frac{240}{720}=\frac{1}{3}$