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Eurico
Assinale a principal e mais comum preocupação de modelos de forma reduzida:
A) ∑{i=1}^{n} x_i y_i = 0 B) ∑{i=1}^{n} x_i x_i = 0 C) ∑{i=1}^{n} y_i u_i = 0 D) ∑{i=1}^{n} x_i u_i = 0 E) ∑_{i=1}^{n} x_i u_i ≠ 0
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