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For the circuit shown in the figure, Thevenin's voltage and Thevenin's equivalent resistance atterminals $a-b$ is

1. $5 \mathrm{~V}$ and $2 \; \Omega$.
2. $7.5 \mathrm{~V}$ and $2.5 \; \Omega$.
3. $4 \mathrm{~V}$ and $2 \; \Omega$.
4. $3 \mathrm{~V}$ and $2.5 \; \Omega$.