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In the circuit shown the op-amp has finite input impedance, infinite voltage gain, and zero input offset voltage. The output voltage $V_{out}$ is 

  1. $-I_{2}(R_{1} + R_{2})$
  2. $I_{2}R_{2}$
  3. $I_{1}R_{2}$
  4. $-I_{1}(R_{1} + R_{2})$
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