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#1 Re: Help Me ! » Bag with balls » 2017-02-20 05:09:37

Dear Bob,
My solution is exactly the same, with the only difference that, since the extra ball can be black or white with probability Pb=Pw=1/2, in the fraction, the numerator and the two terms of the denominator are multiplied by 1/2, which in any case is simplified without affecting the final result.

Many thanks for your assistance!

#2 Re: Help Me ! » Movement of flea » 2017-02-19 22:02:13

Hi all,
I think I've seen this somewhere else, with a slightly different wording. I believe it says that the insect moves by jumps on a straight line and to the same direction.

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