Find P(rolling 2 or 5) with one number cube.

To find the probability of rolling a 2 or a 5 on a number cube, we first need to determine the total number of possible outcomes when rolling the cube, which is 6 (numbers 1 through 6).

Next, we determine the number of favorable outcomes, which in this case includes rolling a 2 or a 5. There are 2 favorable outcomes (rolling a 2 or a 5).

Therefore, the probability of rolling a 2 or a 5 on a number cube is 2/6, or simplified, 1/3.