[gergery]

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thank you for the replys. I was hoping there was some sort of nice trick to do it... but oh well [img]/images/graemlins/grin.gif[/img]

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Stars and bars. 9 stars, 4 bars. Google for elaboration. That enumeration provided is nowhere close to correct.

Spoiler below (which gives the total number of ways that 9 passengers can get off on 5 floors assuming all passengers exit the elevator by the 5th floor):

<font color="white"> Solution: C(13,4) </font>

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I don't think I've been this wrong answering a post in....well, ever.