We have the following:
We know that in total there are 52 cards, of which 13 are diamonds and 13 are club, therefore, the probability of drawing a diamond or a club card is the same, and it would be the following:
[tex]\begin{gathered} p=\frac{13}{52} \\ p=\frac{1}{4} \end{gathered}[/tex]Now, how to draw two, the final probability would be the multiplication of both probabilities
[tex]p=\frac{1}{4}\cdot\frac{1}{4}=\frac{1}{16}[/tex]Therefore, the probability is 1/16 or 6.25%