Standard dice

Q1: What is the probablity of rolling a prime number on a single die?

Q2: What is the probability that the product of the two number rolled on two dice is a prime numer?

Question

Standard dice

Q1: What is the probablity of rolling a prime number on a single die?

Q2: What is the probability that the product of the  two number rolled on two dice is a prime numer?

hartnn · Answer

1/2 for 1st ?

hartnn · Answer

2,3,5 only, right ?

unklerhaukus · Answer

yes

jt950 · Answer

3/6 = 1/2 chance for question one

unklerhaukus · Answer

yes

hartnn · Answer

i could find 3 favourable events for 2nd one

1 with 2,3,5

jt950 · Answer

3 is the chance of get prime number, 6 is total of number of a dice

hartnn · Answer

1,2 and 2,1 is counted as different, right ?
if yes, then 6

psymon · Answer

Im assuming you could count the reverse order, too. If 1 and 3 works then 3 and 1 does, too.

unklerhaukus · Answer

yes

hartnn · Answer

so, 1/6 for 2nd ?

unklerhaukus · Answer

yeah, too easy eh

hartnn · Answer

actually! ;)

psymon · Answer

Kinda sorta D: I still dont like probablity, though ._.

unklerhaukus · Answer

Q3: What is the probability that the sum of the three numbers rolled on three dice is a prime numer?

jt950 · Answer

@UnkleRhaukus Your question is somthing like question 1 as for first dice is 0.5, second is the same or the third instead, so the probability is (0.5)^3?

hartnn · Answer

to many possibilities....
1 for 3, 6 ways to get 5, 1 way to get 17....
and i am feeling kinda bored to calculate for 7,11,and 13