Two resistors of resistances ${\mathrm{R}}_1=100\pm 3\mathrm{\Omega }\text{ and }{\mathrm{R}}_2=200\pm 4\mathrm{\Omega }$  are connected in parallel, then the equivalent resistance in parallel is (in ohm)
$\left(\text{ Use }\frac{1}{{\mathrm{R}}^{\text{'}}}=\frac{1}{{\mathrm{R}}_1}+\frac{1}{{\mathrm{R}}_2}\text{ and }\frac{{\mathrm{\Delta R}}^{\text{'}}}{{\mathrm{\Delta R}}^{\text{'}2}}=\frac{{\mathrm{\Delta R}}_1}{{\mathrm{R}}_1^2}+\frac{{\mathrm{\Delta R}}_2}{{\mathrm{R}}_2^2}\right)$

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