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Sandy Wood
Brain Game: September Morn
by Sandy Wood - December 3, 2008 - 7:30 AM

bloghead_braingames.jpg

I recently added some events to my online 2009 calendar. For those of you whose brows are now furrowed because you know me, yes, I keep a calendar. (I just rarely refer to it.) Anyway, I made an entry for July 8, 2009, which was shown in “American style dating” as 07/08/09 – a neat sequence where each subsequent number is increased by one. So it made me think…

Including 07/08/09, how many
times will a date like that occur between
now and the end of the 21st century?

HERE is the solution.

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Comments (10)

  1. what about a date like 01/23/45?

    posted by Noah on 12-3-2008 at 8:27 am

  2. Shouldn’t it be 5 since the question asks how many MORE times?

    posted by Bri on 12-3-2008 at 8:38 am

  3. What about numbers like ?

    1/2/34 and 1/23/45 (or 12/3/45)

    posted by Eric on 12-3-2008 at 8:42 am

  4. Oops – reread the question. I missed the INCLUDING the first time.

    posted by Bri on 12-3-2008 at 8:45 am

  5. My 5th birthday was: 04/05/67

    reCaptcha: disaster control

    posted by KJ on 12-3-2008 at 9:06 am

  6. There are more than just 6. Here’s what I came up with:
    7/8/09
    8/9/10
    9/10/11
    10/11/12
    11/12/13
    12/13/14
    1/2/34
    2/3/45
    3/4/56
    4/5/67
    5/6/78
    6/7/89
    7/8/90
    12/3/45
    1/23/45

    posted by Valerie on 12-3-2008 at 9:58 am

  7. Valerie, the extra ones you provided only work when you consider individual digits independent of the month/date/year format. As established in the text, the date format is XX/XX/XX.

    Based on that, 03/04/56 doesn’t work. 03/04/05 would, but we’re already past that point in the century.

    Nice thought, though!

    posted by Sandy on 12-3-2008 at 10:47 am

  8. I got 13 total…

    7/8/9
    8/9/10
    9/10/11
    10/11/12
    11/12/13
    12/13/14
    1/2/34
    1/23/45
    2/3/45
    3/4/56
    4/5/67
    5/6/78
    6/7/89

    posted by NateJ on 12-3-2008 at 2:24 pm

  9. I’m personally looking forward to 06/08/10 my 45th birthday!!!

    posted by kev in GA on 12-4-2008 at 12:41 am

  10. kev in GA– Your birthday, 06/08/10 is a pythagorean triple!

    haha, wow

    posted by Jessica on 2-8-2009 at 2:27 pm

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