From: Aidan Keady (aidan at domain ssldesign.com)
Date: Thu 28 Oct 1999 - 15:27:00 IST
> On Thu, Oct 28, 1999 at 08:59:44AM -0500, John_White at domain dell.com mentioned:
> > as easy as it would be to write one that gets the factorial of 5 :)
> > but you'd need a mad data type to store the result in . . .
> That's part of the point! Lisp doesn't mind!
> Question though. I was doing the lotto calculation, and:
> ==> (/ (factorial 42) (factorial 36))
> Is it really a 3.777 billion to one chance of winning now ?
No, you've forgotten the 6! in the bottom line.
C = n!/[r!(n-r)!]
The odds against having the six numbers are only about 5.25 million to 1.
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