What is the probability that a random selected number between 29 and 51 is divisible by 6

There are 33 numbers between 29 and 51 inclusive. Among those numbers, only 30,36,42, and 48 are divisible by 6. So 4/33 of the numbers between 29 and 51 are divisible by 6

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.