Answer
$\frac{1}{126}$
Work Step by Step
Because the order is not important, we can use the combination rule to determine the number of possibilities: $\frac{10!}{(10-5)!5!}=252$.
We also know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$, therefore $P=\frac{2}{252}=\frac{1}{126}$.