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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 classmate of Harold who is an ancestor of Frank is not a grandson of Shannon. We may conclude: Every grandson of Shannon is not a classmate of Harold or not an ancestor of Frank."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
a63b3055-0600-5958-8135-6b26a53f2391
task_key
formal~5ffallacies--main--a63b3055-0600-5958-8135-6b26a53f2391
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import