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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: Every schoolmate of Jeffery is a grandson of Todd. Whoever is schoolmate of Jeffery is at least one of these: a grandson of Todd, a brother of Kenneth or an uncle of Lavern. Every schoolmate of Jeffery is an uncle of Lavern. We may conclude: Everyone who is a schoolmate of Jeffery is a brother 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
64c45cfc-4c47-5587-a835-63c9c7f71090
task_key
formal~5ffallacies--main--64c45cfc-4c47-5587-a835-63c9c7f71090
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import