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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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    Aamir Butt
    wrote on last edited by
    #34

    20th December

    Bombing for Peace is like f****ing For Virginity" 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

      H Offline
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      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

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          CPallini
          wrote on last edited by
          #37

          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

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            S Offline
            smcnulty2000
            wrote on last edited by
            #38

            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

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              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

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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.

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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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                  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

                    M Offline
                    M Offline
                    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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                      D Offline
                      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

                      M 1 Reply Last reply
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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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                        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! ====================================

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                              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

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                                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.

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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
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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

                                          J Offline
                                          J Offline
                                          John Oxley
                                          wrote on last edited by
                                          #53

                                          16th of August

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