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(x−1)(x2−2)(x3−3)⋯(x20−20) \big(x - 1\big)\big(x^2 - 2\big)\big(x^3 - 3\big)\cdots \big(x^{20} - 20\big)(x−1)(x2−2)(x3−3)⋯(x20−20)
What is the coefficient of x203x^{203}x203 in the expansion of this expression?
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