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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: Everyone who is not a great-grandmother of Lily is not both a sister of Tamara and an ancestor of Beverly. Second premise: Nobody is neither a workmate of Nellie nor an ancestor of Beverly. Third premise: Nobody is neither a workmate of Nellie nor a sister of Tamara. From this follows: Nobody is neither a workmate of Nellie nor a great-grandmother of Lily."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
394993f0-f1c5-5bbc-bc63-d6dec2c6dc57
task_key
formal~5ffallacies--main--394993f0-f1c5-5bbc-bc63-d6dec2c6dc57
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import