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OMK 2019 B3

    An arithmetic sequence of five terms is considered goodgood if it contains 19 and 20. For example, 18.5,19.0,19.5,20.0,20.518.5,19.0,19.5,20.0,20.5 is a goodgood sequence. For every goodgood sequence, the sum of its terms is totalled. What is the total sum of all goodgood sequences?

    Dataset text AI-MO AoPS. Quoted with source.

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