Quote:
Ivan Pedroso said:
@Alexti
Ahhhh yeah - that was sloppy.
(7/8)^20*8 is NOT the probality of getting exactly one path missing. You are absolutely right about it not garanteeing that the other 7 paths are present.
Back when I have had time for a better look (sorry 'bout posting too hastilly  )
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Curiously enough, the correct formula (I'm 99% sure
) looks very much like yours, only the sign alternates (see my earlier post, coefficients are the same, only the sign is different).