Hung is just the past tense of hang hanged is present tense. It could be either one sense he didn't really clarify if it would be present tense or past tense.
English
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If you're talking about an execution, like he is asking, then you would use hanged. They are interchangeable but in this situation hung isn't really right
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This situation is interchangeable if he was hung it would be past, "I can't believe they hung him" hanged is present tense "they just hanged him" if you were to use hanged in past tense then you'd be wrong.