"Answer" (Mixed number / Reduced form) and "Operations" (+, -, /, *) are mutual exclusive options and thus need to be done as radio buttons instead of check boxes. They are currently checkboxes. Reproducible: Always
The bug which you are mentioning here regarding the Operations, its not actually a bug. Rather it is the selection of combination of the operators upon which the questions will be given. As far "Answer" part is concerned, I will try fixing it soon.
Git commit 3ac24e5a688847f4534d77d92683b802c054da7f by Aleix Pol, on behalf of Aman Kumar Gupta. Committed on 07/08/2017 at 13:31. Pushed by apol into branch 'master'. kbruch- Change QCheckBoxes under "Answer" section to QRadioButtons to avoid multiple checks. Patch for Bug ID-357657. Replaced QCheckbox objects named "m_AnswerMixedCheck" and "m_ReducedCheck" to QRadioButton to select only one option in displaying the type of Answer(either Mixed Fraction or Reduced form). REVIEW: 130217 M +5 -4 src/MainQtWidget.cpp M +3 -2 src/MainQtWidget.h https://commits.kde.org/kbruch/3ac24e5a688847f4534d77d92683b802c054da7f
*** Bug 335607 has been marked as a duplicate of this bug. ***