hey guys, need some help with this problem. this is one of four permutation problems that our teacher gave us to solve but haven't really figured it out, plus i was sick so i missed the lecture..

3) Repetitions not allowed, how many 3 digit nos. can be formed from the digits 0,1,2,3,4,5?

thanks for the help. we've been given all the basic formula for permutations but I'm at a loss at how to apply them still.