Probability of choosing a card that has an even number on it

Explanation
Cards: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
There are total 17 cards and we are choosing only one card randomly which has even number on it.
The even number cards are: 2 4 6 8 10 12 14 16
That means there are total 8 even number cards.
So, Probability of choosing a card that has an even number on it
