Your fractions are wrong.
You can't keep the denominator (52) constant.
In a bridge game each player has 13 cards, so you and your partner have a total of 26 cards.
What is the probability that you and your partner have exactly Aces for
There are: . possible outcomes.
There are 4 Aces in the deck, and 48 Others.
To get exactly Aces, there are: . ways.
We want cards from the 48 Others: . ways.
. . Hence, there are: . ways to get exactly Aces.