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Maths for fun.

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  • #16
    Originally posted by Smellyferret View Post
    I had to google the problem:

    Blimey, that is a goodun!
    Quite easy to get your head round though (imho!)
    ahhh sorry, I should have posted a link, I wasn't sure how well known it was. when you draw out the probability tree for it and see what all the possibilities are, the answer makes sense...but it still doesn't 'feel' right, just like the birthday problem. there are lots of information based problems like this, where probabilities change by seemingly pointless information. can't remember any of the top of my head though, except the monty hall one...


    • #17
      Originally posted by Smellyferret View Post
      here is another one that seems 'wrong'
      to be that, that one makes perfect sense. It's not really a mathematical problem, more just an egotistical one because we just think about it from out perspective rather than the group as a whole


      • #18
        More gubbins like this!

        Damn those he????????????he words!


        • #19
          Originally posted by Spaceboy View Post
          When I was growing up, I used to love maths. I used to love finding patterns in things, seeing how seemingly unrelated aspects of maths are in fact 2 sides of the same coin or naturally come out of a deeper underlying function etc.

          I like watching maths videos about people playing with numbers, and patterns, and just "mucking about" with math.

          This probably makes me a little bit weird

          However, the point of this post, is I CANNOT get my head around this.

          Proof : 1 + 2 + 3 + 4 + 5 + 6 + ..... = -1/12

          Here's a short version

          I didn't get that, there's a part at 3 minutes in where he's adding the 2 S2's that makes me think there's a trick or something I don't understand.

          Here's a longer version about the same thing

          It's just frying my brain
          holy-thread-revival-batman.jpg but I was just reading an interesting critique of that video and remembered this thread so thought I would share:
          I'm usually a fan of the Numberphile crew, who do a great job making mathematics exciting and accessible, but this video disappointed me. There is a meaningful way to associate the number -1/12 to the series 1+2+3+4, but in my opinion, it is misleading to call it the sum of the series.


          • #20
            Interesting read. I haven't actually watched the original video but that article explains it very well