We have to add 3 + 2i + 1 -5i.

When adding complex and real numbers complex terms can be added with each other only. The same goes for the real terms.

So 3 + 2i + 1 -5i

=> 3 + 1 + 2i -5i

=> 4 - 3i

**The required result is 4 - 3i.**

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