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BIG-Bench Hard / Here comes a perfectly valid argument: First premise: Whoever is not a…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

input

"Here comes a perfectly valid argument: First premise: Whoever is not a half-sister of Perla and not a schoolmate of Gina is not a granddaughter of Deidre, either. Second premise: There is somebody who is a great-grandmother of Margret and a granddaughter of Deidre. So, necessarily, there is somebody who is a great-grandmother of Margret and, in addition, not a half-sister of Perla or not a schoolmate of Gina."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
18011f14-6cc6-534d-a16a-ecc99e0fb759
task_key
formal~5ffallacies--main--18011f14-6cc6-534d-a16a-ecc99e0fb759
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import