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BIG-Bench Hard / Is Siri a stepsister of Mary? Is Susan related to Kate? In large families, it…

Problem

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input

"Is Siri a stepsister of Mary? Is Susan related to Kate? In large families, it is sometimes difficult to keep track of all one's relatives. The following argument seeks to clarify some such relations: To begin with, every daughter of Milagros is not a great-grandmother of Courtney or not an ancestor of Christy. Moreover, nobody is neither a great-grandmother of Courtney nor a niece of Lynn. Finally, being a niece of Lynn is necessary for not being an ancestor of Christy. We may conclude that every daughter of Milagros is a niece of Lynn."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
949ef68b-e60d-5223-953a-846bb7911a34
task_key
formal~5ffallacies--main--949ef68b-e60d-5223-953a-846bb7911a34
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import