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 P: 92 you must take all the resistor together to make 1 substitutional resistane using the following rules: 1. serial placed resistance: $$R_{subst.} = \Sigma R$$ and U is divided over the resistors. 2. parallel circuit: $$\frac {1} {R_{subst.}} = \Sigma \frac {1} {R}$$ and I is divided over the resistors.