Product of equivalent resistances

Circuit: 1

Circuit: 2

Circuit: 3

Circuit: 4

In all the above circuits, there are three resistors each of resistance 1Ω1 \Omega . Let Req1R_{eq_1}, Req2R_{eq_2}, Req3R_{eq_3} and Req4R_{eq_4} be the equivalent resistances of the circuit 11, 22, 33 and 44 respectively. Find Req1×Req2×Req3×Req4 R_{eq_1} \times R_{eq_2} \times R_{eq_3} \times R_{eq_4}

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