ANSWERS: 2
  • that depends if you can re-use the numbers or not (ie: combination 2-2-2) if you can, then there are 9 numbers possible for the first number, the same 9 for the second, and the same 9 for the third. hence you have 9 * 9 * 9 combinations or 729. if you can only use each number once, then you have 9 possibilities for the first number, any of the remaining 8 can be the second number and then any of the still remaining 7 can be the third number. hence you have 9 * 8 * 7 combinations or 504.

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