104 = 10000 if digits can be repeated, 5040 if not.
The above answers assume a code can start with a 0. If not,
9000 if digits can be repeated and 4536 if not.
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45
9876
There are 24.
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.
3*3*2*1 = 18