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According to one possible rule, 80 is wrong and should be replaced by 30 and 90, making the sequence:

5, 15, 30, 90, 180, 540, 1080, ... with the rule "alternatively multiply by 3 and by 2 to get the next term".

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Q: What is the wrong number in the series 5-15-80-180-540-1080?
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