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In a series regulated power supply circuit, the voitage gain $A_{v}$ of the 'pass' transistor satisfies the condition

  1. $\mathrm{A}_{v} \rightarrow \infty$
  2. $1<<\mathrm{A}_{v}<\infty$
  3. $\mathrm{A}_{v} \approx 1$
  4. $\mathrm{A}_{v}<<1$
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