Question Number 175028 by sciencestudent last updated on 16/Aug/22
Commented by mr W last updated on 17/Aug/22
$$\left({a}\right) \\ $$$${R}=\mathrm{990}+\frac{\mathrm{1}}{\frac{\mathrm{1}}{\mathrm{750}}+\frac{\mathrm{1}}{\mathrm{680}}}=\mathrm{1346}.\mathrm{6}\Omega \\ $$