There are 6 numbers on a cube.
The probability of landing on a certain number would be 1/6.
So for the first one to land on two, would be 1/6.
There are 2 numbers greater than 4, so the probability of that happening would be 2/6 ( reduces to 1/3).
To find the probability of both happening together, multiply each probability by each other:
1/6 x 1/3 = 1/18