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The number 1234567890 can create about 39 of 40 4 digit numbers.
There are 7,290 different 4-digit numbers that can be formed from the digits 1-9 without repetition.
840
There are 3024 of them.
256 numbers.
24 different numbers.
There are 34 = 81 numbers.
Without repeats there are 4 × 3 = 12 possible 2 digit numbers. With repeats there are 4 × 4 = 16 possible 2 digit numbers.
There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.
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