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"definition": "random(2..10except g1 g2 g3)", "group": "part 2"}}, "metadata": {"licence": "Creative Commons Attribution 4.0 International", "description": "<p>Rearrange some expressions involving logarithms by applying the relation&nbsp;$\\log_b(a) = c \\iff a = b^c$.</p>"}, "statement": "<p>Changing the subject of an equation involving logarithms often requires the use of the equivalence</p>\n<p>\\[\\log_ba=c \\Longleftrightarrow a=b^c\\text{.}\\]</p>", "rulesets": {}, "variablesTest": {"maxRuns": 100, "condition": ""}, "type": "question", "contributors": [{"name": "Christian Lawson-Perfect", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/7/"}, {"name": "Hannah Aldous", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/1594/"}, {"name": "Maria Aneiros", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/3388/"}]}]}], "contributors": [{"name": "Christian Lawson-Perfect", "profile_url": 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