Final answer:
In a special deck of 13 cards, the worth of an ace can vary depending on the rules of the game being played.
Step-by-step explanation:
The subject of this question is Mathematics, as it involves a scenario with a special deck of cards and requires the understanding of different card values.
The question asks about the worth of an ace in a special deck of 13 cards that includes numbers 2-10, face cards (jack, queen, king), and an ace. In the context of this deck, an ace can be assigned any value the person playing the game decides on. It can be worth 1, 11, or any other value that suits the game being played.
Therefore, the worth of an ace in this particular deck depends on the rules set by the game being played and can vary.