The following is a valid argument: Jim is over sixty. Jan is not as old as Jim. So Jan must be less than sixty.

Name: The following is a valid argument: Jim is over sixty. Jan is not as old as Jim. So Jan must be less than sixty.
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Question

Quizplus · Accepted Answer

The argument assumes that being "not as old as Jim" directly implies being under sixty, which is not necessarily true if Jim is exactly sixty or over sixty. Jan could be less than Jim's age but still be sixty or over if Jim is older than sixty.

The Following Is a Valid Argument: Jim Is Over Sixty