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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, not being a niece of Shirley is sufficient for not being a workmate of Sharita. Now, everyone who is a stepsister of Nichole is a workmate of Sharita, too. We may conclude: Being a niece of Shirley is necessary for not being a stepsister of Nichole."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
2cfbe64f-bfe3-52a3-8893-94b720ad9eb1
task_key
formal~5ffallacies--main--2cfbe64f-bfe3-52a3-8893-94b720ad9eb1
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import