A special calculator has a random number generator button which when pressed, displays a random digit 0, 1, 2, 3, and 4. The button is pressed four times. Assuming that the numbers generated are independent of each other, find the probability of obtaining one '1', one '3' and two '4's in any order.
So in this question. The order doesn’t matter hence its combination instead of permutation however it involves repetition. I really need help understanding how to find the probability to this. I initially did it thinking order mattered and i got 12/625 but since they specified "in any order". How do i come about doing this?