A standard six-sided die is rolled 6 times. You are told that among the rolls, there was one 1, 2 two's, and 3 three's. How many possible sequences of rolls could there have been? (For example, 1,2,3,3,2,3 is one possible sequence.)
This is equivalent to finding out how many identifiable sequences can be made from 1,2,2,3,3,3
This is given by
Number of values !
_______________________________________ =
(Repeated values of 2) ! (Repeated values of 3)!
6! 720 720
_____ = _____ = _____ = 60 identifiable sequences
2! 3! 2 * 6 12