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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: Being a stepbrother of Benjamin is necessary for being a grandson of Alan. Every half-brother of Melvin is a stepbrother of Benjamin. Everyone who is not a cousin of Solomon and not a stepbrother of Dominic is a grandson of Alan or a half-brother of Melvin. So, necessarily, someone who is not a stepbrother of Benjamin is a cousin of Solomon or a stepbrother of Dominic."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
395d7965-bf2b-5ed5-8beb-86d970da36b4
task_key
formal~5ffallacies--main--395d7965-bf2b-5ed5-8beb-86d970da36b4
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import