[tex]\frac{7}{13}[/tex]
1) Let's begin by setting the sample space. So, let's count the number of cards this deck has. Counting them we get there are 13 cards.
2) Subsequently, we need to find the number of favorable events:
[tex]7[/tex]
3) Finally, we can write out the probability of picking an odd number in one withdrawal is:
[tex]P=\frac{7}{13}[/tex]
Since there's no way to simplify this. We can stop it here.
