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

1 Answer
MattyMatty
Dec 3, 2017

19/361936

Explanation:

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

= (1+2+4+6+4+2)/36=1+2+4+6+4+236
= 19/36=1936

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)"

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