A table made the way Alex suggests can contain answer rules. Note that you have to use the ans_rule and ANS methods to accomplish this though, instead of the PGML way. In the table code where you want to add an answer call the ans_rule method of the MathObject answer, and then call ANS with the cmp method of each of those answers after the table code is generated.
WeBWorK Problems
Array construction problems, no idea how to fix it
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