I still don't get it.
Please tell me the difference between "и" ,"i" and "та"
These three terms mean "and" but…
When should I use which one?
Одна Тисяча доларів і тисяча гривень is also correct, isn't it?
Isn't Одна before тисяча necessary? I mean, is it optional?
Yes, it's optional in Ukrainian.