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How Often Do We See Friday The 13th?

by Claude Whitacre
24 replies
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Someone once told me that Friday the 13th was a special day...and very rare.

I did some quick math.

Every month of the year has exactly one 13th in it.

And there are 7 days in the week. One of them is Friday.

So the changes of that 13th of the month being on a Friday are one in seven.

So on average , there is a Friday the 13th once every 7 months.


By the way, that same guy once told me that "Everything happens in threes".

I said "Do you know why? Because after something happens the third time, you start the count over again".

This is why I have no friends.
  • Profile picture of the author Dan Riffle
    Originally Posted by Claude Whitacre View Post

    This is why I have no friends.
    Well, one of many, anyway.
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  • Profile picture of the author Kay King
    On average, there is a Friday the 13th once every 212.35 days. Friday the 13ths occurs with an average frequency of 1.7218 per year or about 3477 since the year 1 CE.

    Google is your friend....



    My trainer met me at the gym this morning pointing out it was Friday the 13th - and telling me of several weird happenings so far this morning. Only mildly motivated to work out today, I joked 'maybe we should skip today just to be safe'... His reply - 'nope - those weights aren't going to lift themselves.'
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    • Profile picture of the author lanfear63
      Originally Posted by Kay King View Post

      Google is your friend....



      My trainer met me at the gym this morning pointing out it was Friday the 13th - and telling me of several weird happenings so far this morning. Only mildly motivated to work out today, I joked 'maybe we should skip today just to be safe'... His reply - 'nope - those weights aren't going to lift themselves.'
      Your response was, your the boss Mr Myers, but do you have to wear that mask when we work out, it's a little creepy.
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    • Profile picture of the author Claude Whitacre
      Originally Posted by Kay King View Post

      Google is your friend....'
      Yup. But this is one of those rare moments that, for a change of pace, I thought I would use reason.


      Originally Posted by Kay King View Post

      My trainer met me at the gym this morning pointing out it was Friday the 13th - and telling me of several weird happenings so far this morning. Only mildly motivated to work out today, I joked 'maybe we should skip today just to be safe'... His reply - 'nope - those weights aren't going to lift themselves.'
      The same thing happens with a full moon.


      There is no difference in anything with a full moon, other than the night is lighted slightly better because there is more light reflected off the moon. The gravity of the moon stays the same in all phases.

      But there is no more instances of crime, no more violence, no more insanity than at any other time. Superstitions are nearly immortal.
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  • Profile picture of the author discrat
    And I thought I was the king of worthless threads
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  • Profile picture of the author lanfear63
    I have a math problem for you. The first one with the correct answer will be revered as a stable genius forever.

    Question

    40 + 40 x 0 + 1 = ?

    Answer, is it..

    A) 1
    B) 41
    C) 82

    PS: Alexa did not answer this correctly for some reason
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    • Profile picture of the author Claude Whitacre
      Originally Posted by lanfear63 View Post

      I have a math problem for you. The first one with the correct answer will be revered as a stable genius forever.

      Question

      40 + 40 x 0 + 1 = ?

      Answer, is it..

      A) 1
      B) 41
      C) 82

      PS: Alexa did not answer this correctly for some reason
      It's 41. But the only reason I know that is that on a Facebook thread Paul Myers posted years ago, there was a similar problem, And I didn't know that (40 X 0) would be a separate set.

      I'm retired...it's a VERY slow day.

      Originally Posted by discrat View Post

      And I thought I was the king of worthless threads
      I'm the king of worthless threads...but also the duke of wasting time because I don't feel like being productive today.
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      • Profile picture of the author lanfear63
        Originally Posted by Claude Whitacre View Post

        It's 41. But the only reason I know that is that on a Facebook thread Paul Myers posted years ago, there was a similar problem, And I didn't know that (40 X 0) would be a separate set.

        I'm retired...it's a VERY slow day.
        40 + 40 = 80 Then we have the answer of 80 and times it by 0 = 0, plus 1 = 1
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        • Profile picture of the author Claude Whitacre
          Originally Posted by lanfear63 View Post

          40 + 40 = 80 Then we have the answer of 80 and times it by 0 = 0, plus 1 = 1
          No. The 40 X 0 is a separate set, even though it doesn't say that in the question.

          The answer 1 is the intuitive answer. The reason this sequence (and others like it) are found far and wide as Facebook and forum posts... is precisely because the set isn't shown, but the math rule still applies. It's a trick question. A joke.

          I made the same mistake years ago, until it was explained, and then I looked it up. Yup.
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          • Profile picture of the author lanfear63
            Originally Posted by Claude Whitacre View Post

            No. The 40 X 0 is a separate set, even though it doesn't say that in the question.

            The answer 1 is the intuitive answer. The reason this sequence (and others like it) are found far and wide as Facebook and forum posts... is precisely because the set isn't shown, but the math rule still applies. It's a trick question. A joke.

            I made the same mistake years ago, until it was explained, and then I looked it up. Yup.
            WINNER I could not throw you off, Mr Stable Genius.
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  • Profile picture of the author Mark Singletary
    For those who worry about strange happenings on Friday the 13th, fear death or accident, etc. rest assured all is well. It's already Saturday morning here so everything turned out okay!

    Mark
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  • Profile picture of the author Kay King
    It's written incorrectly - on purpose I supposed.


    40 + (40 x 0) + 1 = ?


    I thought I was the king of worthless threads

    Nope - you have a lot of competition....
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    • Profile picture of the author Claude Whitacre
      Originally Posted by Kay King View Post

      It's written incorrectly - on purpose I supposed.


      40 + (40 x 0) + 1 = ?
      That's what I thought.

      But somehow, the math rules are that the multiplication is automatically a set. I wasn't aware of that myself. So yeah, it's designed to elicit the wrong answer.
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      • Profile picture of the author Dan Riffle
        Originally Posted by Claude Whitacre View Post

        That's what I thought.

        But somehow, the math rules are that the multiplication is automatically a set. I wasn't aware of that myself. So yeah, it's designed to elicit the wrong answer.
        It's technically not written incorrectly. For this specific question, parentheses could be added for clarity but they aren't required. Order of operations are to be assumed. The question is simply designed to see if you understand PEMDAS.
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        Raising a child is akin to knowing you're getting fired in 18 years and having to train your replacement without actively sabotaging them.

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        • Profile picture of the author lanfear63
          Originally Posted by Dan Riffle View Post

          It's technically not written incorrectly. For this specific question, parentheses could be added for clarity but they aren't required. Oder of operations are to be assumed. The question is simply designed to see if you understand PEMDAS.
          Please End My Depression And Suffering
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          • Profile picture of the author Claude Whitacre
            Originally Posted by lanfear63 View Post

            Please End My Depression And Suffering
            Smarter than anything I was going to come up with. Well Done.

            Originally Posted by Dan Riffle View Post

            It's technically not written incorrectly. For this specific question, parentheses could be added for clarity but they aren't required. Oder of operations are to be assumed. The question is simply designed to see if you understand PEMDAS.
            And now the world knows that I do not.

            If I commit suicide because of this public humiliation....it's your fault.

            Murder by death.
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            • Profile picture of the author Dan Riffle
              Originally Posted by Claude Whitacre View Post

              And now the world knows that I do not.

              If I commit suicide because of this public humiliation....it's your fault.

              Murder by death.
              I don't think it's anything worthy of humiliation. Had they even created math yet when you were in school?
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              Raising a child is akin to knowing you're getting fired in 18 years and having to train your replacement without actively sabotaging them.

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              • Profile picture of the author tagiscom
                Originally Posted by Dan Riffle View Post

                I don't think it's anything worthy of humiliation.
                Thank you Dan, (that is another thing off my bucket list).

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              • Profile picture of the author lanfear63
                Originally Posted by Dan Riffle View Post

                I don't think it's anything worthy of humiliation. Had they even created math yet when you were in school?
                The only thing he learned in school was about tables, the ones in the dining hall.
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  • Profile picture of the author max5ty
    Originally Posted by Claude Whitacre View Post

    By the way, that same guy once told me that "Everything happens in threes".

    I said "Do you know why? Because after something happens the third time, you start the count over again".
    Or when someone loses something and then finds it...

    "I looked everywhere and It was the very last place I looked"

    yes, it probably was because you stopped looking after that
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  • Profile picture of the author Odahh
    That math problem I think brought back memories of seventh grade math . My Dear Aunt Sally . Multiple then decide then add then subtract.

    As far as Friday the 13 th . The Free Masons claim their lineage as the knights templer. And the king of France with the permission of the pope had like 15000 knights templer arrested. The on Friday the13th 1307 the leaders and many others where burned at the steak.

    It was an attempt to get all the wealth the templers had but that disappeared along with the navy of the templers.

    So superstitious yes but with an interesting history if you understand how many of the founding fathers and leaders of the USA where free masons. Nothing sinister about it.
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  • Profile picture of the author Kay King
    burned at the steak.

    I think they were burned at the stake - it was not a barbecue....
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