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One minus One plus One... Gives an unexpected result [Maths]
posted June 27 2013 9:44.17 by Giorgos Lazaridis

Here is the question: 1-1+1-1+1-1+1-... What is the result of this series if it is infinitely repeated? Try to predict the result and then watch the following video. Its amazing!


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  • At 3 August 2013, 23:54:33 user rod wrote:   [reply @ rod]
    • I can't believe proclaimed educated mathematicians would fall into this ridiculous trickery and mathematical fallacy.
      1-1 1-1 1-1... could only be either 0 or 1 depending on how many numbers(addends) you are willing to deal with. If you have an even number of negative and positive addends you would end up with a sum of zero, but if you have an odd number of addends you would end up with a sum of 1 if you started with 1( else -1 if you started with -1).
      The only confusion in arriving at the correct answer is in the arbitrariness in how far "..." can go. Infinity is not a number but just an idea of unending continuity. If you want to introduce infinity in a calculation it has to be defined first with certainty, if not, you would end up with something that cannot be determined precicely.

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