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BIG-Bench Hard / Here comes a perfectly valid argument: To begin with, every close friend of…

Problem

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input

"Here comes a perfectly valid argument: To begin with, every close friend of Francine is a cousin of Samantha or an ancestor of Janice or a close friend of Shanika. Moreover, every close friend of Francine is a cousin of Samantha. Finally, being a close friend of Shanika is necessary for being a close friend of Francine. We may conclude: Being an ancestor of Janice is necessary for being a close friend of Francine."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
e1c0c9d0-6bfb-57e6-be9d-737c3064b8a2
task_key
formal~5ffallacies--main--e1c0c9d0-6bfb-57e6-be9d-737c3064b8a2
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import