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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

    H Offline
    H Offline
    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

        S Offline
        S Offline
        smcnulty2000
        wrote on last edited by
        #37

        June 7. First day of Vestalia.

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

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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

          C Offline
          C Offline
          CPallini
          wrote on last edited by
          #38

          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

            J Offline
            J Offline
            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

            D 1 Reply Last reply
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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.

              K Offline
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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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                J Offline
                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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                • J Johann Gerell

                  July 16. When can we se your analysis of this experiment? ;)

                  -- Time you enjoy wasting is not wasted time - Bertrand Russel

                  D Offline
                  D Offline
                  Dalek Dave
                  wrote on last edited by
                  #42

                  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

                    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

                    M Offline
                    M Offline
                    Mustafa Ismail Mustafa
                    wrote on last edited by
                    #43

                    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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                    • 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

                        P Offline
                        P Offline
                        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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                          • 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! ====================================

                            B Offline
                            B Offline
                            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

                              A Offline
                              A Offline
                              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[^]

                                B Offline
                                B Offline
                                blackjack2150
                                wrote on last edited by
                                #49

                                That crashed my IE8.

                                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

                                  D Offline
                                  D Offline
                                  Dan_Martin
                                  wrote on last edited by
                                  #50

                                  9th May

                                  1 Reply Last reply
                                  0
                                  • 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

                                    O Offline
                                    O Offline
                                    ormonds
                                    wrote on last edited by
                                    #51

                                    10 Dec

                                    1 Reply Last reply
                                    0
                                    • 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

                                        J Offline
                                        J Offline
                                        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

                                          0 Offline
                                          0 Offline
                                          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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