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AIME 2004a Problem 7

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Let CC be the coefficient of x2x^2 in the expansion of the product (1−x)(1+2x)(1−3x)⋯(1+14x)(1−15x).(1 - x)(1 + 2x)(1 - 3x)\cdots(1 + 14x)(1 - 15x). Find ∣C∣.|C|.

Dataset text AIME 1983 to 2026. Quoted with source.

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