The open question type is the default question type for questions with mathematical answers.

Placeholders

Add a placeholder from the Texts tab via + Add -> ... Placeholder An optional placeholder text is available per answer field, where you can specify a formula (see Texts for the syntax). Variables can be used in the placeholder text. To specify an input box in the formula editor, you can use the \Box macro in TeX. e,g, #x=\Box#

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