#### Answer

$\frac{1}{3}$

#### Work Step by Step

There are 6 possible outcomes of tossing a single die: 1, 2, 3, 4, 5, 6.
"1 or 6" represent 2 of the 6 possible outcomes, so the probability is 2 out of 6.
$\frac{2}{6}=\frac{2\div 2}{6\div 2}=\frac{1}{3}$