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  3. To test a theory. (Shared Birthdays)

To test a theory. (Shared Birthdays)

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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

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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

                            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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                              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

                                      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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                                        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.

                                        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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                                          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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