# For the experiment of tossing a six sided die twice, what is the probability that the sum is odd or prime?

Dec 3, 2017

$\frac{19}{36}$

#### Explanation:

$= P \left[\text{2, 3, 5, 7, 9, or 11 eyes}\right]$

$= \frac{1 + 2 + 4 + 6 + 4 + 2}{36}$
$= \frac{19}{36}$

 P[ "k eyes (*)"] = {((k-1)/36", 2"<="k"<="7"),((13-k)/36", 7"<="k"<="12"),(" 0 , otherwise (k<2 or k>12)"):}

$\text{(*) when tossing twice (or tossing two dice)}$