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  3. To test a theory. (Shared Birthdays)

To test a theory. (Shared Birthdays)

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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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                                    • 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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                                      yesu prakash
                                      wrote on last edited by
                                      #63

                                      OCT 28th

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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 Neely
                                        wrote on last edited by
                                        #64

                                        what part of NO TEXT don't you understand. wait, my hypocrisy's showing? :doh:

                                        The European Way of War: Blow your own continent up. The American Way of War: Go over and help them.

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                                        • J Jwalant Natvarlal Soneji

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

                                          Jwalant Natvarlal Soneji, BE IT, India

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                                          dreamaway820
                                          wrote on last edited by
                                          #65

                                          Mine is the 19th of September! :)

                                          The woods are lovely, dark, and deep But I have promises to keep and lines to code before I sleep, and lines to code before I sleep...

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