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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 premise: Being a great-grandmother of Elizabeth is sufficient for not being a sister of Gillian. Second premise: Every great-grandmother of Elizabeth is a sister of Gillian or an ancestor of Helen or a great-grandmother of Heather. Third premise: Being a great-grandmother of Elizabeth is sufficient for not being a great-grandmother of Heather. It follows that everyone who is a great-grandmother of Elizabeth is an ancestor of Helen, too."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
6f90d168-8258-5198-8d00-ff8142c9369a
task_key
formal~5ffallacies--main--6f90d168-8258-5198-8d00-ff8142c9369a
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import