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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 expert of AS Saint-Étienne is an admirer of FC Krasnodar. Every ex-fan of FC Sion is not an expert of AS Saint-Étienne or not an ex-fan of Osmanlıspor. Being an admirer of FC Krasnodar is necessary for being an ex-fan of Osmanlıspor. We may conclude: Being an ex-fan of FC Sion is sufficient for being an admirer of FC Krasnodar."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
7e74f87d-9814-5e1b-86d0-1de940632e74
task_key
formal~5ffallacies--main--7e74f87d-9814-5e1b-86d0-1de940632e74
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import