Question

When rolling a fair die, what is the probability of rolling a four or a five?









1/6
1/3
3/6
4/6

Answer 1

To find the probability of rolling a four or a five on a fair six-sided die, we first determine the total number of possible outcomes when rolling the die, which is 6 (the numbers 1 through 6).

Next, we identify the favorable outcomes for the event of rolling a four or a five. There are 2 favorable outcomes: a 4 and a 5.

The probability can be calculated using the formula:

\[
\text{Probability} = \frac{\text{Number of favorable outcomes}}{\text{Total number of possible outcomes}}
\]

Substituting in the numbers:

\[
\text{Probability} = \frac{2}{6} = \frac{1}{3}
\]

Therefore, the probability of rolling a four or a five is \( \frac{1}{3} \).