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## Homework Statement

Let X be a set containing all four digit numbers made up of {1,2,3}, where every number contains every digit at lease once. Number of all subsets is:

## The Attempt at a Solution

So firs i have to find number of elements in the set:

3!*3 + 3*12 = 54

Now what they mean by subsets? And did i calculated number of elements correctly?