Metro

Lexington eighth-grader wins math contest

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Alec Sun of Jonas Clark Middle School in Lexington won a national math competition in Washington on Friday by correctly answering a question about integers. The eighth-grader was one of 224 students at the 2013 Raytheon Mathcounts National Competition, and won an $8,000 college scholarship and a trip to the US Space Camp in Hunstville, Ala. He won by answering in less than 45 seconds what the greatest integer is that must be a factor of the sum of any four consecutive positive odd integers; he answered eight. In the team competition, Massachusetts won for the second year in a row.

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