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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: Whoever is not a classmate of Alvin is a schoolmate of Wilburn. Whoever is not a son of Charles is however a stepbrother of Ivan or a schoolmate of Wilburn. Nobody is neither a classmate of Alvin nor a stepbrother of Ivan. It follows that whoever is not a classmate of Alvin is a son of Charles."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
36abaa31-7596-570d-86f6-2cccc206407e
task_key
formal~5ffallacies--main--36abaa31-7596-570d-86f6-2cccc206407e
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import