Let a bag contain ten balls numbered $1,2, \ldots, 10$. Let three balls be drawn at random in sequence without replacement, and the number on the ball drawn on the $i^{\text {th }}$ choice be $n_{i} \in\{1,2, \ldots, 10\}.$ What is the probability that $n_{1} < n_{2} < n_{3} ?$
- $\frac{1}{3}$
- $\frac{1}{12}$
- $\frac{1}{4}$
- $\frac{1}{6}$
- None of the above