Answer: 1/48
To solve this problem, we take the probability of each step (each time he rolled) then multiply the fraction together. For the first roll, there is half a chance he will roll an even number.
Even numbers in a standard die: 2, 4, 6
Numbers (faces) in a standard die: 1, 2, 3, 4, 5, 6
3/6 = 1/2.
For the second roll, there is 1/6 of a chance that he will roll a 6, since, there is only one face with six on it and six faces in total.
For the third roll, there is 1/6 of a chance that he will roll a 4, since, there is only one face with four on it and six faces in total.
The last step is to multiply these results together. 1/2 * 1/6 * 1/4 = 1/48.