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BIG-Bench Hard / It is not always easy to see who is related to whom -- and in which ways. The…

Problem

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input

"It is not always easy to see who is related to whom -- and in which ways. The following argument pertains to this question: To begin with, nobody is neither an ancestor of Alvin nor a workmate of Tony. Moreover, whoever is a schoolmate of Keith is not an ancestor of Alvin. Therefore, everyone who is a schoolmate of Keith is a workmate of Tony, too."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
8e828522-a980-5d8c-bf39-9f4ad8bec716
task_key
formal~5ffallacies--main--8e828522-a980-5d8c-bf39-9f4ad8bec716
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import