FranticFish - 8:50 pm on Apr 25, 2010 (gmt 0)
I noticed on a site I was appraising this week that the numbers were the reverse of what I'd expect.
I'd expect the initial site: query to return a number or urls. If there were 'Supplemental' results then at the bottom of the results on the last page you'd have the option to see more urls. That second list of urls would be bigger.
However on this site this week I was not presented with that option once (even though I know the site has loads of dupe content that would be 'Supplemental'). The initial number of urls was big - and once I'd got as far as Google was prepared to take me through the results, it would fall - sometimes by a large percentage.