Oh, what a happy little question! Let's see, using the numbers 0, 2, 5, and 8, there are 24 different combinations you can create. You can arrange them in various ways like 0258, 0825, 5280, and so on. Just like painting, the possibilities are endless and it's all about finding the beauty in each combination.
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There is 1 combination of all ten numbers, 10 combinations of one number and of nine numbers, 45 combinations of two or eight numbers, 120 combinations of three or seven numbers, 210 combinations of four or six numbers and 252 combinations of five numbers. That is 1023 = 210 - 1 in total.
1,000,000. Specifically, they are all numbers from 000000-999999
There are 10C4 = 10*9*8*7/(4*3*2*1) combinations of 4 digits that are all different. That is, 210 of them, and I have no inclination to list them.
150,200
Including the null combination, there are 2^14 = 16384 combinations.