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The input impedance, $Z_{in}\left ( s \right )$ for the network shown is

  1. $\frac{23s^{2}+46s+20}{4s+5}$
  2. $6s+4$
  3. $7s+4$
  4. $\frac{25s^{2}+46s+20}{4s+5}$
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