Digit d is randomly selected from the set {1, 2, 3, 4, 5, 6, 7, 8,
9}. Without replacement of d, another digit, e is selected. What
is the probability that the two digit number de is a multiple of 3?

... >>>this is for my math bonus! Any help will be appreciated=]

Remember, this is for your math bonus, not mine.
Maybe I can ask you some questions that may help.

How many numbers are in the set [de]?
Is [ed] the same set?
Can you describe the set [de]?

I think that might help, take a little time to think on that.