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Stats Question

  1. Oct 23, 2007 #1
    I have no experience in stats and I was wondering if this problem can be solved using stats instead of creating a java program. Can someone please help me.

    I am trying to find out how many 4 digits numbers exist that have the same digit repeated in that number twice. And how many 4 digits numbers exist that have the same digit repeated in that number three times.

    For example:

    5797: The digit 7 appears twice
    0410: The digit 0 appears twice

    3888: The digit 8 appers three times

    So I want to know how many times the digit is repated twice and how many times the digit is reapted three times in the range from 0000-9999.

    Can somoene please help me.
     
  2. jcsd
  3. Oct 24, 2007 #2

    EnumaElish

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    Yes it can be. This is a combinatorial problem.

    how many 4 digits numbers exist = 10C4

    same digit repeated twice: you are looking at patterns ddxy, dxdy, dxyd, xddy, xdyd, xydd. How many combinations are possible with each of d, x, y taking on values 1, ..., 10?
     
  4. Oct 24, 2007 #3
    I am not sure how to do solve this problem. I never took Stats.
     
  5. Oct 28, 2007 #4

    EnumaElish

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    It is a counting problem really.
     
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