0
Anonymous
There are 3 choices for each of the 4 digits, so the total number of possibilities is
3 x 3 x 3 x 3 = 81 different 4-digit numbers.
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99999
10
5040 numbers can be made.
15 of them.
24 of them.
There are 60480 numbers.
There are 4^6 = 4096 such numbers.
8.
125
13579
there are 22
6, if you don't repeat any numbers.