What is the effective resistance ?

6 $\Omega$ 4 $\Omega$ 1 $\Omega$ 2 $\Omega$

4 $\Omega$

$\text{R}_{eff} =  2 + 4||4$ $\text{R}_{eff} =  2 + 2$ $\text{R}_{eff} =  4 \Omega$