[ww-bugs] Bug 3587: New: Error in answer to Library/Michigan/Chap12Sec2/Q05.pg

[bugzilla-daemon at webwork.maa.org]

http://bugs.webwork.maa.org/show_bug.cgi?id=3587

           Summary: Error in answer to Library/Michigan/Chap12Sec2/Q05.pg
           Product: Problem Libraries
           Version: unspecified
          Platform: Macintosh
        OS/Version: Mac OS
            Status: NEW
          Severity: critical
          Priority: P5
         Component: Library (OPL)
        AssignedTo: jj at asu.edu
        ReportedBy: jmlinhart at cwu.edu
        Web browser Chrome
           version:


With seed value 437 (and some others), my student got a question
for z = 2x^2
cross sections with z fixed give

and the student uses a pull-down menu to select the answer.  In this case, the
answer should be
an empty set or a single vertical line in a plane parallel to the xy plane or
two vertical lines in a plane parallel to the xy plane,
which is, in fact, the third option in the pull-down menu.  These options
correspond to z < 0, z = 0, and z > 0 respectively.

However, the correct answer comes up as
two vertical lines in a plane parallel to the xy plane

There are other randomizations that have this problem (and some do not).  Seed
1735 has a similar problem.

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