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BIG-Bench Hard / Is Fred a cousin of Robert? Is Joe related to Bob? In large families, it is…

Problem

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input

"Is Fred a cousin of Robert? Is Joe related to Bob? In large families, it is sometimes difficult to keep track of all one's relatives. The following argument seeks to clarify some such relations: First of all, every great-grandfather of Chad is an ancestor of Douglas or a cousin of Henry. Next, every schoolmate of Trevor is neither a cousin of Henry nor an ancestor of Douglas. Hence, no great-grandfather of Chad is a schoolmate of Trevor."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
44dc4837-b17e-5130-ace3-6e8e9fa6dd1a
task_key
formal~5ffallacies--main--44dc4837-b17e-5130-ace3-6e8e9fa6dd1a
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import