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  3. To test a theory. (Shared Birthdays)

To test a theory. (Shared Birthdays)

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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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    Jwalant Natvarlal Soneji
    wrote on last edited by
    #28

    18th Sept. Anyone? . . . No one... :)

    Jwalant Natvarlal Soneji, BE IT, India

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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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      NandoMan
      wrote on last edited by
      #29

      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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      • 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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        Alan Burkhart
        wrote on last edited by
        #30

        18 January

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        • M Mike Ellison

          November 6. If anyone wants to send me a present then, let me know :-)

          www.MishaInTheCloud.com

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          Jorgen Sigvardsson
          wrote on last edited by
          #31

          Yay! Mine's also November 6. :)

          -- Kein Mitleid Für Die Mehrheit

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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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            Reelix
            wrote on last edited by
            #32

            12 June, and all alone...

            -= Reelix =-

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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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              cable beach
              wrote on last edited by
              #33

              Actually, i think they share the same month, not the exact date. This is a theory of combinatorics (the pigeon hole principle) rather than probability. In any event: 13th February

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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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                Aamir Butt
                wrote on last edited by
                #34

                20th December

                Bombing for Peace is like f****ing For Virginity" My Articles

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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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                  Hornwood509
                  wrote on last edited by
                  #35

                  7th January

                  -- For a moment, nothing happened. Then, after a second or so, nothing continued to happen --

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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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                    blackjack2150
                    wrote on last edited by
                    #36

                    The way I know it: If you have 366 people in a room, it's guaranteed (100%) that at least 2 share their birthday, which is obvious. If you have 23 people in a room, it's likely (> 50%) that at least 2 share their birthday, which is not obvious, but it's mathematically proved to be true.

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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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                      smcnulty2000
                      wrote on last edited by
                      #37

                      June 7. First day of Vestalia.

                      _____________________________ Will work for ... BRAINS!!! BRAINS!!!!

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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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                        CPallini
                        wrote on last edited by
                        #38

                        19th Jun.

                        If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                        This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
                        [My articles]

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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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                          Johann Gerell
                          wrote on last edited by
                          #39

                          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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                          • C Christian Graus

                            17 Feb

                            Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

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                            kduffingb
                            wrote on last edited by
                            #40

                            17 Feb also :laugh: :laugh:

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                            • O Oakman

                              Jun 10

                              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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                              JDL EPM
                              wrote on last edited by
                              #41

                              Oakman wrote:

                              Jun 10

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

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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
                                #42

                                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

                                  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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                                  Mustafa Ismail Mustafa
                                  wrote on last edited by
                                  #43

                                  February 12

                                  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

                                    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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                                    M Offline
                                    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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