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The number 1234567890 can create about 39 of 40 4 digit numbers.
36
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.
The final digit must be a 2 to form an even number. The first digit may be any of three remaining digits (1, 3, 5) while the second digit may be any of the two remaining digits. All together, that makes 3*2 = 6 distinct even numbers.
10,000
The number 1234567890 can create about 39 of 40 4 digit numbers.
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
27 three digit numbers from the digits 3, 5, 7 including repetitions.
They are all single digit numbers.
24
500
There are 60480 numbers.
840
There are 3024 of them.
180 of them.
There are 5*4*3 = 60 such numbers.
1 set