Product of equivalent resistances

Electricity and Magnetism Level 1

Circuit: 1

Circuit: 2

Circuit: 3

Circuit: 4

In all the above circuits, there are three resistors each of resistance $1 \Omega$ . Let $R_{eq_1}$ , $R_{eq_2}$ , $R_{eq_3}$ and $R_{eq_4}$ be the equivalent resistances of the circuit $1$ , $2$ , $3$ and $4$ respectively. Find $R_{eq_1} \times R_{eq_2} \times R_{eq_3} \times R_{eq_4}$