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BIG-Bench Hard / Some football fans admire various clubs, others love only a single team. But…

Problem

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input

"Some football fans admire various clubs, others love only a single team. But who is a fan of whom precisely? The following argument pertains to this question: Every devotee of AEK Larnaca FC is a supporter of Club Atlético de Madrid and a member of RSC Anderlecht. Whoever is not a supporter of Club Atlético de Madrid is an opponent to Fenerbahçe SK. Whoever is not a member of RSC Anderlecht is an opponent to Fenerbahçe SK. We may conclude: Being an opponent to Fenerbahçe SK is necessary for being a devotee of AEK Larnaca FC."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
bf2d5337-502c-5764-8a12-c076a904b9a7
task_key
formal~5ffallacies--main--bf2d5337-502c-5764-8a12-c076a904b9a7
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import