So! Was I right in my answer to last week's MGRE Math Beast Challenge problem? Yes, indeed: the correct answer is C. For those who missed my explanation, see here. MGRE's explanation follows almost exactly the same pattern as mine.
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All comments are subject to approval before they are published, so they will not appear immediately. Comments should be civil, relevant, and substantive. Anonymous comments are not allowed and will be unceremoniously deleted. For more on my comments policy, please see this entry on my other blog.