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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 start with, being a close friend of Catherine is necessary for not being a classmate of Leslie. Now, being a granddaughter of Courtney is necessary for not being a classmate of Leslie. Moreover, whoever is not a classmate of Mary is however a close friend of Catherine or a granddaughter of Courtney. In consequence, whoever is not a classmate of Leslie is a classmate of Mary."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
d6bff480-a39b-586a-a6f8-754ea965c2dd
task_key
formal~5ffallacies--main--d6bff480-a39b-586a-a6f8-754ea965c2dd
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import