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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: Every aunt of Amanda is a stepsister of Nicole. Every stepsister of Nicole is either a stepsister of Kerstin or a classmate of Tanisha, or both. We may conclude that to be a stepsister of Kerstin or a classmate of Tanisha is necessary for being an aunt of Amanda."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
052f4f0b-b830-5fa4-ae1c-f172135a6b62
task_key
formal~5ffallacies--main--052f4f0b-b830-5fa4-ae1c-f172135a6b62
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import