10. Suppose there are two dice (cubes, with six faces each marked with 1 to 6 dots), if you roll them once, then the probability of at least one die showing 1 dot is $\qquad$ .
10. $\frac{11}{36}$ Hint: Consider three cases, the first die shows 1 point while the second does not; the first does not show 1 point while the second does; both show 1 point. Their probabilities are: $\frac{1}{6} \times \frac{5}{6}, \frac{1}{6} \times \frac{5}{6}, \frac{1}{6} \times \frac{1}{6}$.