The effective resistance between points $A$ and $B$ for the following network is (each branch has a resistance of $R$):

$A$ piece of wire is cut into four equal parts and the pieces are bundled together side by side to form a thicker wire. Compared with that of the original wire,the resistance of the bundle is ..........

$A$ wire has a resistance of $12 \, \Omega$. It is bent in the form of an equilateral triangle. The effective resistance between any two corners of the triangle is

The total resistance between $x$ and $y$ is ...... $\Omega$.

The equivalent resistance between $A$ and $B$ is $:-$

The equivalent resistance of two resistors connected in series is $6 \ \Omega$ and their parallel equivalent resistance is $\frac{4}{3} \ \Omega$. What are the values of the resistances?