Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Happy Math

  1. Feb 27, 2005 #1

    T@P

    User Avatar

    26/65 = 2/5 (cross out the sixes)

    16/64 = 1/4 (again cross out the sixes)

    are there anymore *interesting* numbers like this?

    by interesting i mean that its not 11/11, since you can obviously cross out the 1's and get 1/1. the numbers have to be different

    also, are there any 3 digit ones where you can cross out 2 of the digits? (etc, etc)
     
  2. jcsd
  3. Feb 28, 2005 #2

    Alkatran

    User Avatar
    Science Advisor
    Homework Helper

    Program:
    Code (Text):

    Private Sub Form_Load()
    Dim x As Single
    Dim z As Single
    Dim y As Single
        For x = 1 To 1000
        For z = 1 To 1000
            If 10 * x / z <> 1 Then
                y = 9 * x / (10 * x / z - 1)
                If y = CLng(y) And y > 0 And (y <> x Or y <> z) Then
                    If CSng(x & y) / CSng(y & z) = x / z Then
                        Debug.Print x & ", " & z & ", " & y & ": " & x & y & "/" & y & z & "=" & x & "/" & z
                    End If
                End If
            End If
        Next z
        Next x
    End Sub
     
    Results:
    1, 4, 6: 16/64=1/4
    1, 5, 9: 19/95=1/5
    2, 5, 6: 26/65=2/5
    4, 8, 9: 49/98=4/8

    There are no 3 digit non-trivial (x=y=z) cases (at least for x and z, possibly for y).
     
  4. Feb 28, 2005 #3

    T@P

    User Avatar

    thanks alot for all the help. :)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Happy Math
Loading...