One common example of a combination arrangement is a circuit with resistors arranged in a “star” or “delta” configuration.
In a star configuration, resistors are connected at a central node, with one terminal of each resistor connected to the central node and the other terminal connected to different points in the circuit. This arrangement doesn’t fit the definition of series or parallel because the current flowing through each resistor is not the same, and the voltage drop across each resistor may vary.