Suppose I have an AC current source and I want to combine them to give maximum sum, should I use series or parallel combination?

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Hanno Krieger

Parallel. Because you are asking for current. Serial if you aim at voltage.

Mengran Yu

Simply apply the KCL. Should be connected in parallel for current sources.

H.-P. Schulze

Current means applying the node set, that is, Parallel and is explained in each primary textbook of electrical engineering and calculated examples.