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2003 AMC 10BProblem 1P1-10~1 minPrint
Algebraic ManipulationSet up the equation/formula and compute; no special trick needed

Which of the following is the same as

2−4+6−8+10−12+143−6+9−12+15−18+21?\frac{2-4+6-8+10-12+14}{3-6+9-12+15-18+21}?

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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 12B #1.