# Math Help - Probability

1. ## Probability

Hey guys !

I need help with the problem below:

If a fair 6-sided die is rolled once, what is the probability of rolling a 3 or an odd number?

Thanks,

2. ## Re: Probability

Originally Posted by fsiwaju
If a fair 6-sided die is rolled once, what is the probability of rolling a 3 or an odd number?

$T$ is the event of rolling a three, $O$ is the event of rolling an odd.

$\mathcal{P}(T\cup O)=\mathcal{P}(T)+\mathcal{P}(O)-\mathcal{P}(T\cap O)$.

3. ## Re: Probability

Consider Efron’s non-transitive dice where the 6 faces as are in the table below.

Die A 0 0 4 4 4 4
Die B 3 3 3 3 3 3
Die C 2 2 2 2 6 6
Die D 1 1 1 5 5 5

Suppose there are four players in the game and each will choose one die and roll it. The person
who rolls the smallest number will be eliminated. For each die, calculate the probability that
the smallest number observed occurs on that die. Now which die would you choose (assuming
you want to stay in the game rather than reading a good book, having root canal work, etc.)?

plpease help me. Thank you

4. ## Re: Probability

Here is the OP.
Originally Posted by fsiwaju
If a fair 6-sided die is rolled once, what is the probability of rolling a 3 or an odd number?
What does the reply have to do with that?

Originally Posted by vijaysingh
Consider Efron’s non-transitive dice where the 6 faces as are in the table below.
Die A 0 0 4 4 4 4
Die B 3 3 3 3 3 3
Die C 2 2 2 2 6 6
Die D 1 1 1 5 5 5

Suppose there are four players in the game and each will choose one die and roll it. The person
who rolls the smallest number will be eliminated. For each die, calculate the probability that
the smallest number observed occurs on that die. Now which die would you choose (assuming
you want to stay in the game rather than reading a good book, having root canal work, etc.)?
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