// Numbas version: exam_results_page_options
{"name": "Adrian's copy of Conditional visibility", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"variable_groups": [{"variables": ["scenario"], "name": "Scenario"}, {"variables": ["a", "b", "c"], "name": "Quadratic equation"}], "advice": "", "functions": {}, "variablesTest": {"condition": "", "maxRuns": 100}, "metadata": {"description": "<p>Show one of several blocks of text depending on the value of a&nbsp;question variable.</p>\n<p>As well as a simple check for the value of a variable, the condition to display a block of text can be a complex expression in any of the question variables - in this example, depending on the discriminant of the generated quadratic.</p>", "notes": "", "licence": "Creative Commons Attribution 4.0 International"}, "type": "question", "preamble": {"css": "", "js": ""}, "tags": ["conditional visibility", "demo"], "showQuestionGroupNames": false, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [], "name": "", "pickQuestions": 0}], "parts": [], "ungrouped_variables": [], "variables": {"b": {"definition": "random(-6..6 except 0)", "group": "Quadratic equation", "templateType": "anything", "description": "", "name": "b"}, "c": {"definition": "random(-4..4 except 0)", "group": "Quadratic equation", "templateType": "anything", "description": "", "name": "c"}, "a": {"definition": "random(1..3)", "group": "Quadratic equation", "templateType": "anything", "description": "", "name": "a"}, "scenario": {"definition": "random(1,2,3)", "group": "Scenario", "templateType": "anything", "description": "<p>Choose between three scenarios.</p>", "name": "scenario"}}, "name": "Adrian's copy of Conditional visibility", "rulesets": {}, "statement": "<p>First, this question picks between three scenarios.</p>\n<div data-jme-visible=\"scenario=1\">\n<p>This is Scenario 1.</p>\n</div>\n<div data-jme-visible=\"scenario=2\">\n<p>This is Scenario 2.</p>\n</div>\n<div data-jme-visible=\"scenario=3\">\n<p>This is Scenario 3.</p>\n</div>\n<p>Now, consider the quadratic equation</p>\n<p>\\[ \\simplify{{a}x^2+{b}x+{c} = 0} \\]</p>\n<p>The discriminant of this equation is $\\simplify[!basic]{{b}^2-4*{a}*{c}} = \\var{b^2-4*a*c}$. <span data-jme-visible=\"b^2-4*a*c&gt;0\">This is greater than zero, so the equation has two real roots.</span>&nbsp;<span data-jme-visible=\"b^2-4*a*c=0\">As this is zero, the equation has one repeated root.</span> <span data-jme-visible=\"b^2-4*a*c&lt;0\">This is less than zero, so the equation has no real&nbsp;roots.</span></p>", "contributors": [{"name": "Adrian Jannetta", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/164/"}]}]}], "contributors": [{"name": "Adrian Jannetta", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/164/"}]}