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How Many Number Combinations Can You Make Out Of 6 Digits From 0 To 9?

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chenghui guo Profile
chenghui guo answered
9*8*7=504,so the answer is 504.
Oddman Profile
Oddman answered
There are 10^6 = 1 million different arrangements of 6 digits if sequence matters and the digits are allowed to repeat. The first and last few are
  000000, 000001, 000002, ..., 999997, 999998, 999999.

If sequence doesn't matter, and the digits are not allowed to repeat, you can make 10!/(6!*4!) = 210 different combinations. The first and last few are
    {0, 1, 2, 3, 4, 5}, {0, 1, 2, 3, 4, 6}, {0, 1, 2, 3, 4, 7}, ..., {3, 4, 5, 6, 7, 8}, {3, 4, 5, 6, 7, 9}, {4, 5, 6, 7, 8, 9}

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