Question

You roll a standard number cube. Find P(3 or 4).

Answer 1

By a standard number cube, do you mean a dice?
If so then the probabilty of rolling a number, x is as follows:
P(1)=1/6 as there is one face on a die that has a number 1, and six faces it can land on
P(2)=1/6
P(3)=1/6 etc etc

So the probability of rolling
P(3) = 1/6
and P(4)=1/6

then the P(3) or P(4) = P(3 or 4) = ?

Answer 2

1/3 = P(3or4)