Question

Find the equivalent resistance between points $A$ and $B$.

Answer 1

$\frac{1}{R_1}=\frac{1}{3}+\frac{1}{3}+\frac{1}{3}=\frac{3}{3}=1$
$\therefore R_1=1\Omega$
$R_2=5\Omega$

$\frac{1}{R_3}=\frac{1}{4}+\frac{1}{6}=\frac{3+2}{12}=\frac{5}{12}$
$R_3=\frac{12}{5}=2.4\Omega$

Total $R=R_1+R_2+R_3$
$=1+5+2.4=8.4\Omega$.