b. \(\dfrac{1}{R}=\dfrac{1}{R1}+\dfrac{1}{R2}\Rightarrow\dfrac{1}{R2}=\dfrac{1}{R}-\dfrac{1}{R1}=\dfrac{1}{180}-\dfrac{1}{380}=\dfrac{1}{342}\Rightarrow R2=342\Omega\)
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