Don't do question #6 on the homework; it's much harder than we meant it to be. Incidentally, the answer is "it depends on n (low n's are all possible, up to some number, after which it is not)."
Part of this homework is review. Questions 1 and 2 come from sections 2.1-2.3 of Lincoln and Polk. Question 5 comes from section 1.4, which we did not cover in clas. The remainder of the homework comes from sections 4.1-4.2.
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smile.