20 Jul
2010
20 Jul
'10
9:09 a.m.
On Tue, Jul 20, 2010 at 12:05 AM, Robert Munafo <mrob27@gmail.com> wrote:
[...] In this case, the inner box has only one particle inside, so there are
10 choose 1 = 10 ways to choose a labeling of the inner box; the outer box has two particles inside, so there are 20 choose 2 = 380 ways. Thus there are 3800 ways to label the system in all.
I thought "20 choose 2" was 20*19/2 = 190. Likewise, 10 choose 2 would be 45. So, a ratio of 4.5, not a ratio of 9. What did I miss?
Nothing, of course. It was a dumb mistake. - Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com