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$R_{A}$ and $R_{B}$ are the input resistances of circuits as shown below. The circuits extend infinitely in the direction shown. Which one of the following statements is TRUE?

  1. $R_{A}=R_{B}$
  2. $R_{A}=R_{B}=0$
  3. $R_{A}< R_{B}$ 
  4. $R_{B}= R_{A} /(1+R_{A})$
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