Ace or king

What is the probability that we will choose an ace or a king when choosing from a deck of sevens cards?

Correct answer:

p =  0.25

Step-by-step explanation:

$$\begin{gathered} n=32 \\ e=4 \\ k=4 \\ p={\displaystyle \frac{e+k}{n}}={\displaystyle \frac{4+4}{32}}={\displaystyle \frac{1}{4}}=0.25 \end{gathered}$$

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