clipka <ano### [at] anonymousorg> wrote:
> >   3) Assume two people, person A and person B, who want to decide who gets
> > a price by tossing a coin.
> > 
> >   Person A is a bad loser and a bully, so if he loses he says "I said it's
> > two out of three". So they play it like that. If A loses again, he says
> > "I said it's three out of five", and so on, until he wins.
> > 
> >   How many tosses is this game expected to last, in average?

> I think that very much depends on whether the sequence is

>    1 - 3 - 5 - 7 -  9 - ...

> or

>    1 - 3 - 5 - 9 - 17 - ...

  How would "four out of nine" work? If there are nine tosses, four wins
wouldn't yet be decisive.

  Of course it's "4 out of 7", "5 out of 9", "6 out of 11" and so on.

-- 
                                                          - Warp

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