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~If~ the numbers can be used repeatedly (e.g. "2222"), then the answer is 54, or 625. If each digit must be unique, then the answer is 5 * 4 * 3 * 2, or 240.
There are 12 such numbers.
There are 24.
3*3*2*1 = 18
9,000
I assume you mean how many 4-digit numbers can be made from a set such as {A,A, B, C} where A, B and C are single digits. There are 12 such numbers.