// Numbas version: finer_feedback_settings
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"description": ""}}, "metadata": {"licence": "Creative Commons Attribution 4.0 International", "description": "<p>Choose which of 5 matrices are in a) row echelon form but not reduced b) reduced row echelon form c) neither.</p>"}, "rulesets": {}, "tags": [], "advice": "<p>Look at your notes for the definition of echelon form.</p>", "variablesTest": {"maxRuns": 100, "condition": ""}, "preamble": {"js": "", "css": ""}, "statement": "\n    <p><strong>Echelon Forms</strong></p>\n  <p>For each of the following matrices choose which are:</p>\n  <p>a) In row echelon form but not in reduced row echelon form.</p>\n  <p>b) In reduced row echelon form.</p>\n  <p>c) Neither a) nor b).</p>\n    ", "ungrouped_variables": ["b23", "d", "g26", "g24", "g25", "g22", "g23", "u1", "u2", "g45", "g46", "c13", "c12", "g33", "mf1", "mf2", "mb1", "mb2", "mb3", "a", "c", "b", "g35", "g34", "g36", "f", "t", "w", "v", "g16", "g15", "g14", "g13", "g12"], "parts": [{"scripts": {}, "showCorrectAnswer": true, 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