There are 4 kings and 4 queens in a standard deck of cards, then you have a total of 8 cards that are favorable when you draw your first card, from a total of 52, we have the following probability:
[tex]\text{probability}=\frac{8}{52}=\frac{2}{13}[/tex]After you draw the first card, the number of them in the deck becomes 51, since there are 4 Ace cards in a deck, the probability of drawing an ace on the second card is:
[tex]\text{probability}=\frac{4}{51}[/tex]