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BIG-Bench Hard / It is not always easy to see who is related to whom -- and in which ways. The…

Problem

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input

"It is not always easy to see who is related to whom -- and in which ways. The following argument pertains to this question: First, being an ancestor of Christy is necessary for being a daughter of Denise. Second, not being a cousin of Maryann is sufficient for not being an ancestor of Christy. We may conclude that whoever is not a daughter of Denise is a cousin of Maryann."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
0ef4dc34-9937-5c92-be5c-8381e0152820
task_key
formal~5ffallacies--main--0ef4dc34-9937-5c92-be5c-8381e0152820
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import