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  3. To test a theory. (Shared Birthdays)

To test a theory. (Shared Birthdays)

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  • J Johann Gerell

    July 16. When can we se your analysis of this experiment? ;)

    -- Time you enjoy wasting is not wasted time - Bertrand Russel

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    Dalek Dave
    wrote on last edited by
    #43

    I will publish an analysis later today, but already there are several shared birthdays.

    ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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    • D Dalek Dave

      I will publish an analysis later today, but already there are several shared birthdays.

      ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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      Mustafa Ismail Mustafa
      wrote on last edited by
      #44

      So long as we get presents...

      If the post was helpful, please vote, eh! Current activities: Book: Devils by Fyodor Dostoyevsky Project: Hospital Automation, final stage Learning: Image analysis, LINQ Now and forever, defiant to the end. What is Multiple Sclerosis[^]?

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      • D Dalek Dave

        Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

        ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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        Pete OHanlon
        wrote on last edited by
        #45

        This is just basic probability. One of my favourite maths experiments is to ask people whether or not they are more likely to roll two consecutive 6s with a dice or a 2 then a 3.

        "WPF has many lovers. It's a veritable porn star!" - Josh Smith

        As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

        My blog | My articles | MoXAML PowerToys | Onyx

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        • N NandoMan

          I believe you are a bit wrong. If you have 366 people, you can guarantee that at least 2 people share birthdays. It´s called "the Pigeonhole principle" http://en.wikipedia.org/wiki/Pigeonhole_principle[^]

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          Chris Quinn
          wrote on last edited by
          #46

          You would need 367 if one of the people in the room was my younger brother - 29th Feb

          ==================================== Transvestites - Roberts in Disguise! ====================================

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          • C Chris Quinn

            You would need 367 if one of the people in the room was my younger brother - 29th Feb

            ==================================== Transvestites - Roberts in Disguise! ====================================

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            blackjack2150
            wrote on last edited by
            #47

            Chris Quinn wrote:

            You would need 367 if one of the people in the room was my younger brother - 29th Feb

            Or my former boss.

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            • D Dalek Dave

              Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

              ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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              AndyStephens
              wrote on last edited by
              #48

              The probability of at least two people sharing the same birthday is 0.5073. Yay, I've found a use for Wolfram Alpha! http://www04.wolframalpha.com/input/?i=same+birthday&f1=23&f=BirthdayProblem.n_23&x=5&y=9[^]

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              • A AndyStephens

                The probability of at least two people sharing the same birthday is 0.5073. Yay, I've found a use for Wolfram Alpha! http://www04.wolframalpha.com/input/?i=same+birthday&f1=23&f=BirthdayProblem.n_23&x=5&y=9[^]

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                blackjack2150
                wrote on last edited by
                #49

                That crashed my IE8.

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                • D Dalek Dave

                  Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                  ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                  Dan_Martin
                  wrote on last edited by
                  #50

                  9th May

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                  • D Dalek Dave

                    Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                    ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                    ormonds
                    wrote on last edited by
                    #51

                    10 Dec

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                    • L Lost User

                      Trafalgar Day. (that might make some scratch their heads!)

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                      ormonds
                      wrote on last edited by
                      #52

                      Now that has to be Oct 30 1805, doesn't it?

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                      • D Dalek Dave

                        Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                        ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                        John Oxley
                        wrote on last edited by
                        #53

                        16th of August

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                        • D Dalek Dave

                          Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                          ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                          0x3c0
                          wrote on last edited by
                          #54

                          July 19th. There's that theory broken ;P

                          Between the idea And the reality Between the motion And the act Falls the Shadow

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                          • O ormonds

                            Now that has to be Oct 30 1805, doesn't it?

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                            The Real Geek
                            wrote on last edited by
                            #55

                            Hmm, 21st I think, which is a shame because it would have matched mine - 30th Oct :-)

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                            • O ormonds

                              Now that has to be Oct 30 1805, doesn't it?

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                              Lost User
                              wrote on last edited by
                              #56

                              No. http://www.bbc.co.uk/history/british/empire_seapower/launch_ani_trafalgar.shtml[^]

                              modified on Wednesday, August 5, 2009 5:37 AM

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                              • T The Real Geek

                                Hmm, 21st I think, which is a shame because it would have matched mine - 30th Oct :-)

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                                Lost User
                                wrote on last edited by
                                #57

                                The Real Geek wrote:

                                21st I think

                                :thumbsup:

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                                • 0 0x3c0

                                  July 19th. There's that theory broken ;P

                                  Between the idea And the reality Between the motion And the act Falls the Shadow

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                                  sthotakura
                                  wrote on last edited by
                                  #58

                                  19 July

                                  Cheers, Suresh

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                                  • D Dalek Dave

                                    Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                                    ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                                    rabryst
                                    wrote on last edited by
                                    #59

                                    I know two Dylans born on the same day in the same year, and who know each other: 3 May 1977.

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                                    • D Dalek Dave

                                      Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                                      ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                                      Pheadjack
                                      wrote on last edited by
                                      #60

                                      Nov 29th :) so close to Christmas that my B-day gifts and Christmas gifts were often part of a 'set'. sigh...

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                                      • J JDL EPM

                                        Oakman wrote:

                                        Jun 10

                                        Does it count if this is my wife's birthday?

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                                        Oakman
                                        wrote on last edited by
                                        #61

                                        JDL-EPM wrote:

                                        Does it count if this is my wife's birthday?

                                        If she has a little bit of luck, she'll never be forced to share a room with me - even a waiting room as an airport, so probably not.

                                        Jon "One loves to possess arms, though they hope never to have occasion for them." --Thomas Jefferson to George Washington, 1796. Soap Box 1.0: the first, the original, reborn troll-less

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                                        • D Dalek Dave

                                          Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                                          ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                                          pughjl
                                          wrote on last edited by
                                          #62

                                          March 31st

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