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Ensure exercises use randVar() in math-format (is there a reason for it being in math-format rather than just math?) when generating variable names. Ensure variable names don't include u or v, which could be confused.
Part of me thinks students ought to be able to distinguish u and v, but then again, the exercises are meant to test their mathematical ability, not their ability to read the Latin alphabet.
Deals with #43236 and #43385.
Remove u and v from array of possible variables
Make sure exercises use randVar when picking a random variable
Use a less ambiguous letter
Test plan: minimal
Merge pull request #43434 from petercollingridge/randvar2
fix #43236; fix #43385;
Test plan: check each exercise still displays an equation
Auditors: beneater, cbhl