Question

What is the probability of drawing a black card or an eight from a standard deck of cards?

Answer 1

There are 52 cards in a standard deck of cards.

There are 26 black cards and 2 red eights (eight of diamonds and eight of hearts) among them.

The sought probability

$$P=\cfrac{26+2}{52}=\cfrac{28}{52}=\cfrac{7}{13}.$$