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- $I = \frac { n E } { n r + R } \quad$ for $n$

A) $n = \frac { I R } { I r + E }$

B) $n = \frac { - R } { \operatorname { Ir } - \mathrm { E } }$

C) $\mathrm { n } = \mathrm { IR } ( \mathrm { Ir } - \mathrm { E } )$

D) $n = \frac { I R } { E - I r }$

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