1. Joined
    02 Mar '04
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    10 Mar '04 20:44
    What do the numbers 11, 69, and 88 all have in common?
  2. Joined
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    5776
    10 Mar '04 21:35
    Originally posted by DumDum81
    What do the numbers 11, 69, and 88 all have in common?
    they all look the same upside down or in a mirror.
  3. R.I.P.
    Joined
    21 Dec '01
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    10 Mar '04 21:38
    They are all numbers 😀
  4. central usa
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    11 Mar '04 17:421 edit
    Originally posted by chatterbox
    they all look the same upside down or in a mirror.
    upside down (as in rotated 180 degrees in the plane of the writing surface) is right, but not in a mirror, at least not 69, which will make the digits themselves look backwards (a reversed "9" looks remotely like the "@" )!

    here is a slightly more dificult problem:
    assuming we retain the present calendar, what will be the next time we see a year that reads the same if inverted (i'm talking as written, not as shown in a seven-element digital display)?
  5. I'm in Checkmate
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    11 Mar '04 17:49
    3003?
  6. central usa
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    11 Mar '04 18:33
    Originally posted by qwiksylver
    3003?
    oops! i need to clarify.
    "inverted" as in "rotating 180 degrees in the plane of the writing surface" if you do that with 3003, you get something like "E00E".
    the method you suggest rotates around a horizontal axis through the middle of each digit, but you have to leave the plane of the writing surface.
    sorry for the confusion!
  7. Joined
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    25805
    11 Mar '04 19:24
    Originally posted by BarefootChessPlayer
    upside down (as in rotated 180 degrees in the plane of the writing surface) is right, but not in a mirror, at least not 69, which will make the digits themselves look backwards (a reversed "9" looks remotely like the "@" )!

    here is a slightly more dificult problem:
    assuming we retain the present calendar, what will be the next time ...[text shortened]... e if inverted (i'm talking as written, not as shown in a seven-element digital display)?
    6009?
  8. central usa
    Joined
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    20097
    12 Mar '04 18:04
    Originally posted by iamatiger
    6009?
    yup!
    can you figure out the rest of the four-digit ones?
  9. I'm in Checkmate
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    11 Mar '04
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    842
    12 Mar '04 18:181 edit
    1001
    1111
    1691
    1881
    6119
    9116
    8118
    6009
    9006
    6699
    6969
    6889
    8008
    8698
    8968
    8888
    9006
    9886
    9696
    And thats all I got off the top of my head
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