Question

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

Answer 1

`19/36`

Explanation:

`= P[ "2, 3, 5, 7, 9, or 11 eyes" ]`

`= (1+2+4+6+4+2)/36`
`= 19/36`

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

`"(*) when tossing twice (or tossing two dice)"`