b $\mathrm{R}_{\mathrm{eq}}=\frac{2}{3}+2=\frac{8}{3}, \quad \mathrm{V}=2 \mathrm{\,V} \quad \therefore \mathrm{i}=\frac{\mathrm{V}}{\mathrm{R}_{\mathrm{eq}}}=\frac{3}{4} \mathrm{\,A}$
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