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In the Digital-to-Analog converter circuit shown in the figure below, $V_{R}=10 \mathrm{~V}$ and $\mathrm{R}=10 \; \mathrm{k} \Omega$.

The voltage $V_{o}$ is

  1. $-0.781 \mathrm{~V}$
  2. $-1.562 \mathrm{~V}$
  3. $-3.125 \mathrm{~V}$
  4. $-6.250 \mathrm{~V}$
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