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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, being a workmate of Lowell is sufficient for not being a brother of Ron. Moreover, there is no brother of Ron who is a close friend of Kenneth yet not a workmate of Lowell. It follows that everyone who is a brother of Ron is a close friend of Kenneth, 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
db0daded-451c-5b5e-aaff-736a293a6568
task_key
formal~5ffallacies--main--db0daded-451c-5b5e-aaff-736a293a6568
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import