How do we find P (rolling 2 or 5) with one number cube?

The sample space of the rolling the cube is 6.

The probability of rolling 2 in a cube is 1. So p (2) is 1/6

Similarly the probability of rolling 5 in cube is 1.

So, p (5) = 1/6

To find p (2 or 5) which is p (2) + p (5)

p (2) + p (5) = 1/6 + 1/6 which is 2/6.

2/6 can be reduced to 1/3.

so right answer is 1/3