Are the 3 resistors in parallel or in series?
Well, \$\text{R}_3\$, \$\text{R}_4\$, \$\text{R}_5\$ and \$\text{R}_6\$ are in parallel and they are in series with \$\text{R}_1\$ and \$\text{R}_2\$.







simulate this circuit &ndash; Schematic created using CircuitLab

So the total resistance is:

$$\text{R}_\text{total}=\text{R}_1+\text{R}_2+\frac{1}{\frac{1}{\text{R}_3}+\frac{1}{\text{R}_4}+\frac{1}{\text{R}_5}+\frac{1}{\text{R}_6}}$$