Resistors R1 and R2 are connected in series, then their total resistance is:
R12 = R1 + R2 = 1.5 + 1.5 = 3 ohms.
Resistors R3 and R4 are connected in series, then their total resistance is:
R34 = R3 + R4 = 1.5 + 1.5 = 3 ohms.
Resistors R12 and R34 are connected in parallel, then their total resistance is:
Rob = R12 * R34 * (R12 + R34) = 9/6 = 3/2 = 1.5 Ohm.
Answer: The total resistance of the circuit section is 1.5 ohms.
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