No rule for this one
No ending or word group predicts the article of Ticket. Learn it as a pair and say it out loud: das Ticket.
das Ticket
It's das Ticket. Ticket is neuter, plural die Tickets.
Das Ticket kostet drei Euro.
The ticket costs three euros.
No ending or word group predicts the article of Ticket. Learn it as a pair and say it out loud: das Ticket.