Extend randomization of multiple alternatives for cases, where one alternative must be "true"
Certain evaluation schemes for multiple choic…
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Extend randomization of multiple alternatives for cases, where one alternative must be "true"Certain evaluation schemes for multiple choice questions require thatat least one alternative must be true. Otherwise, a division by 0might appear. This is an issue, when a subset of alternatives is used(e.g. 3 out of 10 alternatives). The version know evaluation schemeswith such a requirement and makes sure that in the resulting set, atleast one correct alternative is correct. Note: this change does notmake sure that the full set of alternatives contains at least onecorrect alternative.
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