There are 52 cards in a deck
There are 4 Aces and 4 cards that are 9's = 8 cards that we want
the ways it cannot occur is 52 - 8 =44
the ratio of the number of ways that an outcome can occur compared to how many ways it cannot occur
8 : 44
Divide each side by 4
8/4 : 44/4
2 : 11