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You are dealt one card from a standard 52-card deck. Find the probability of being dealt an ace or a 9. Enter your answer in a reduced fraction form.

Solution

You are dealt one card from a standard 52-card deck. Find the probability of being dealt an ace or a 9. Enter your answer in a reduced fraction form.

Solution

\frac{2}{13}

Solution steps

Find the probability of being dealt an ace:

\frac{1}{13}

Find the probability of a 9;.:

\frac{1}{13}

Since the events are disjoint, Use the formula

P (X_{1} \lor X_{2} \lor \dots \lor X_{k}) = P (X_{1}) + P (X_{2}) + \dots + P (X_{k})

= \frac{1}{13} + \frac{1}{13}

\frac{1}{13} + \frac{1}{13} = \frac{2}{13}

= \frac{2}{13}

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