When you roll a six-sided number cube you can get the following possible results:
[tex]\lbrace1,2,3,4,5,6\rbrace[/tex]Then, you have 6 possible result.
To find the probability of rolling P(odd or 2) you find the set of numbers in the possible results that are odd or 2:
[tex]\text{odd or 2=}\lbrace1,2,3,5\rbrace[/tex]You have 4 possible results that are odd or 2.
Then, the probability is: The possible results that are odd or two divided in the total of possible results
[tex]P(\text{odd or 2)=}\frac{4}{6}=\frac{1}{3}[/tex]Then, the probability of rolling odd or 2 is 1/3