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  3. To test a theory. (Shared Birthdays)

To test a theory. (Shared Birthdays)

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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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                          Lost User
                          wrote on last edited by
                          #55

                          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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                          • 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
                            #56

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

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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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                                        • 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

                                          Y Offline
                                          Y Offline
                                          yesu prakash
                                          wrote on last edited by
                                          #63

                                          OCT 28th

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