SOLUTION: the digits 0 thru 9 are written on 10 pieces of paper, how many 3- digit combinations can b formed by using 3 of theses pieces of paper?

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Question 441448: the digits 0 thru 9 are written on 10 pieces of paper, how many 3- digit combinations can b formed by using 3 of theses pieces of paper?
Answer by Edwin McCravy(20055)   (Show Source): You can put this solution on YOUR website!


C(10,3) = 120

Here they all are, count em:

{0,1,2}  {0,1,3}  {0,1,4}  {0,1,5}  {0,1,6}  {0,1,7}  {0,1,8}  {0,1,9}  {0,2,3}  {0,2,4}
{0,2,5}  {0,2,6}  {0,2,7}  {0,2,8}  {0,2,9}  {0,3,4}  {0,3,5}  {0,3,6}  {0,3,7}  {0,3,8}
{0,3,9}  {0,4,5}  {0,4,6}  {0,4,7}  {0,4,8}  {0,4,9}  {0,5,6}  {0,5,7}  {0,5,8}  {0,5,9}
{0,6,7}  {0,6,8}  {0,6,9}  {0,7,8}  {0,7,9}  {0,8,9}  {1,2,3}  {1,2,4}  {1,2,5}  {1,2,6}
{1,2,7}  {1,2,8}  {1,2,9}  {1,3,4}  {1,3,5}  {1,3,6}  {1,3,7}  {1,3,8}  {1,3,9}  {1,4,5}
{1,4,6}  {1,4,7}  {1,4,8}  {1,4,9}  {1,5,6}  {1,5,7}  {1,5,8}  {1,5,9}  {1,6,7}  {1,6,8}
{1,6,9}  {1,7,8}  {1,7,9}  {1,8,9}  {2,3,4}  {2,3,5}  {2,3,6}  {2,3,7}  {2,3,8}  {2,3,9}
{2,4,5}  {2,4,6}  {2,4,7}  {2,4,8}  {2,4,9}  {2,5,6}  {2,5,7}  {2,5,8}  {2,5,9}  {2,6,7}
{2,6,8}  {2,6,9}  {2,7,8}  {2,7,9}  {2,8,9}  {3,4,5}  {3,4,6}  {3,4,7}  {3,4,8}  {3,4,9}
{3,5,6}  {3,5,7}  {3,5,8}  {3,5,9}  {3,6,7}  {3,6,8}  {3,6,9}  {3,7,8}  {3,7,9}  {3,8,9}
{4,5,6}  {4,5,7}  {4,5,8}  {4,5,9}  {4,6,7}  {4,6,8}  {4,6,9}  {4,7,8}  {4,7,9}  {4,8,9}
{5,6,7}  {5,6,8}  {5,6,9}  {5,7,8}  {5,7,9}  {5,8,9}  {6,7,8}  {6,7,9}  {6,8,9}  {7,8,9}


Edwin
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