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You are dealt one card from a 52-card deck. Find the probability that you are dealt an ace or a black card.

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Solution

Youaredealtonecardfroma52−carddeck.Findtheprobabilitythatyouaredealtanaceorablackcard.

Solution

137​
+1
Decimal
0.53846…
Solution steps
Find the probability of you are dealt an ace:131​
Find the probability of a black card:21​
Find the probability of you are dealt an ace and a black card:261​
Use the Inclusion-Exclusion formula P(X∨Y)=P(X)+P(Y)−P(X∧Y)=131​+21​−261​
131​+21​−261​=137​
=137​

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