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You randomly select one card from a 52-card deck. Find the probability of selecting a red eight or a black nine.

Solution

You randomly select one card from a 52-card deck. Find the probability of selecting a red eight or a black nine.

Solution

\frac{1}{13}

Solution steps

Find the probability of getting red 8 :

\frac{1}{26}

Find the probability of getting black 9 :

\frac{1}{26}

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}{26} + \frac{1}{26}

\frac{1}{26} + \frac{1}{26} = \frac{1}{13}

= \frac{1}{13}

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