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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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    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

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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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