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2003 AMC 10AProblem 1P1-10~1 minPrint
Sequences & SeriesSet up the equation/formula and compute; no special trick neededExploit symmetry to reduce work or pair up objects

What is the difference between the sum of the first 20032003 even counting numbers and the sum of the first 20032003 odd counting numbers?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site. Also appeared as 2003 12A #1.