Subject:
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Re: math question (or pattern... whatever...)
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Tue, 4 Mar 2003 00:16:43 GMT
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Viewed:
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2161 times
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On Mon, Mar 03, 2003 at 11:37:58PM +0000, David Eaton wrote:
> I don't quite get why this works-- if you're doing rand($#bag), won't that
> always pick r, r, or w for the 1st value? Hence, theoretically, you could
> pick "wb", which isn't in your sample set... on the other hand, you're
> increasing the chance that you'll pick "rr" since you can't pick b first,
> and are more likely to pick r. I'm amazed either that this works out by luck
> to 33%, or that there's some underhanded secret-math-logic as to why this is
> an equivalent situation.
doh, you're right :) Also, I was calculating the chance of getting 2
red marbles, in general, not checking the chance given the first one was
red... :)
That's what you get when you do an experiment, and have an expected
solution in your mind... you get a bug, but it tells you what you
wanted to know, so you accept it.
For the curious, my original program, after fixed by Dave, returns 16%.
:)
--
Dan Boger
dan@peeron.com
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Message is in Reply To:
 | | Re: math question (or pattern... whatever...)
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| (...) I don't quite get why this works-- if you're doing rand($#bag), won't that always pick r, r, or w for the 1st value? Hence, theoretically, you could pick "wb", which isn't in your sample set... on the other hand, you're increasing the chance (...) (24 years ago, 3-Mar-03, to lugnet.off-topic.geek)
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