This is the 10323rd most frequent Turkish word.
biletlerinde
"On their tickets" or "in their tickets."
In this sentence, 'biletlerinde' means 'on the tickets', indicating location or condition of the tickets.
Konser biletlerinde büyük bir indirim vardı.
There was a big discount on concert tickets.
Here, 'biletlerinde' refers to the tickets possessing information, i.e., the seat numbers are annotated on them.
Tiyatro biletlerinde koltuk numaraları belirtilmiştir.
The seat numbers are indicated on the theater tickets.
'Biletlerinde' in this context shows possession and the tickets' characteristics, where a wrong date is noted.