I have been messing up the partition function for thermo all semester, and now it's really starting to bite me with the carry-down error (i.e. mess up Z for (a) which in turn will mess up S in (b) and so on). I was looking at Reif Problem 9.1 and was wondering if someone could please explain this to me? We have a test in it tomorrow and the rest of it I have figured out. For those without Reif: two particles, 3 energy states, find the partition function for (a) classical MB statistics, (b) BE stats, and (c) FD stats.