There are 13 spades, the probability that the spade we already have is an ace is therefore 1/13.
The game of blackjack is played with a deck consisting of 13 cards (one of each of the numbers 2-10, one jack, one queen, one king, and one of ace) in each of four suits: clubs, diamonds, hearts, and spades.
In a game of blackjack, if your first card is a spade, what are the odds that it is an ace?
[a] 1/52
[b] 1/26
[c] 1/13
[d] 1/4
[e] 5/13