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  3. To test a theory. (Shared Birthdays)

To test a theory. (Shared Birthdays)

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  • M Mark_Wallace

    Marc Clifton wrote:

    My birthday (month, day, not year) is the same as Bill Clinton's.

    So you don't know the difference between European and African?

    I wanna be a eunuchs developer! Pass me a bread knife!

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    Mark_Wallace
    wrote on last edited by
    #27

    25th July, btw. And a quick head reckoning says that it's 39-40 people for an evens chance. Of course, it's 6.30 am, here, so my arithmetic might not be all that it can be.

    I wanna be a eunuchs developer! Pass me a bread knife!

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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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                        CPallini
                        wrote on last edited by
                        #37

                        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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                          smcnulty2000
                          wrote on last edited by
                          #38

                          June 7. First day of Vestalia.

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

                          1 Reply Last reply
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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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                                • 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
                                  #42

                                  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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                                  • 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

                                      M Offline
                                      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[^]

                                          C Offline
                                          C Offline
                                          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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