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Gustavo
Assinale a principal e mais comum preocupação de modelos de forma reduzida: A. ∑i=1nzibi=0\sum_{i=1}^{n} z_{i} b_{i} = 0∑i=1nzibi=0 B. ∑i=1nzizi=0\sum_{i=1}^{n} z_{i} z_{i} = 0∑i=1nzizi=0 C. ∑i=1n3ziui=0\sum_{i=1}^{n} 3 z_{i} u_{i} = 0∑i=1n3ziui=0 D. ∑i=1nziui=0\sum_{i=1}^{n} z_{i} u_{i} = 0∑i=1nziui=0 \iff E. ∑i=1nziui≠0\sum_{i=1}^{n} z_{i} u_{i} \neq 0∑i=1nziui=0
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