(Of course 와/과 is determined by the final consonant of the preceding noun, or lack of it). But, other than that, are these completely interchangeable?
Can 와/과, 하고, (이)랑 be chosen regardless of context/situation?
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Native Korean here :)
If you use it as a meaning of 'and', then yes, they are all usable with almost no nuance differences, other than the fact that 랑 is used more frequently in spoken language.
However, 하고 can have other meanings such as 'with (someone/something)' or 'and then' etc.
랑 can also mean 'with (someone/something).