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

Problem

Answer published by the source. Consult the official source to check your work against its answer.

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, Merle is a cousin of Annie. Now, whoever is not both a classmate of Hazel and a cousin of Annie is a great-grandmother of Doria. We may conclude that it is false that Merle is a great-grandmother of Doria."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
c3aca27a-575e-5b94-98cc-312a9bdc28e9
task_key
formal~5ffallacies--main--c3aca27a-575e-5b94-98cc-312a9bdc28e9
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import