Question 1080233
Integers in the range divisible by 4:4,8,12,16,20,24,28- 7 of them
Integers in the range greater than 25 and less than 30:26,27,28,29- 4 of them
Integers in both groups: 28 - 1 of them
So,
{{{P=(7+4-1)/30=10/30=1/3}}}