Answer:
30.8% or 4/13
Explanation:
There are 52 cards in a deck of cards.
There are 4 nines (4/52) and 13 (13/52) diamonds in a deck of cards.
When you add them together, you get 17/52. Then, you have to subtract the card that is both a nine and in a diamond suite, so you subtract -1 because there is only one card that fits both categories. You should have 16/52, which simplifies to 4/13 / 30.8%.