The rule of probability is
[tex]P(A)=\frac{A}{\text{total}}[/tex]Since the die has 6 numbers, then
The total = 6
Since there are 5 numbers without 3, then
A = 5
Substitute them in the rule above
[tex]P(\text{not}3)=\frac{5}{6}[/tex]The answer is 5/6