Questions & Answers about De møttes ved en tilfeldighet.
Here De means they.
It is capitalized simply because it is the first word in the sentence. In older or very formal Norwegian, De can also mean formal you, but that usage is rare in modern everyday Norwegian. In this sentence, the normal reading is they.
Because the verb here is å møtes, which means to meet each other.
So:
- De møtte ham = they met him
- De møttes = they met each other
The -s form often gives the verb a reciprocal meaning here, so møttes is the natural choice when two or more people meet one another.
The dictionary form is å møtes.
In this sentence, møttes is the preterite (simple past) form:
- å møtes = to meet each other
- møtes = meet/are meeting
- møttes = met