Question

In the figure given below, the equivalent resistance between $A$ and $B$ is $1\Omega$ . What is the value of unknown resistance $R$ ?

Answer 1

The equivalent resistance is equal to

$\frac{1}{1}=\frac{1}{3}+\frac{1}{3}+\frac{1}{R}$

Therfeore,

$R=3\Omega$