In the following picture:

- You always have right of way (2).
- Correct answer: You should give right of way to the red vehicle (1) in the roundabout.
- The driver of the red vehicle should give you right-of-way.
- You have right-of-way in any case, because you come from the right.
Why this is the answer
The correct answer in the official bank: You should give right of way to the red vehicle (1) in the roundabout.
A vehicle already inside the roundabout has right-of-way over a vehicle that wants to enter it. So slow down before the entrance, stop if necessary, and give right-of-way to the red vehicle moving in the roundabout. The "coming from the right" rule gives no right-of-way to a vehicle entering the roundabout.