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פּוֹפּוּלָרִי Word Problems >

You are dealt one card from a 52-card deck. Find the probability that you are dealt a spade or a non dash picture card.

פתרון

Y o u a re d e a lt o n e c a r d f ro m a ​ 52 - c a r d d ec k . F in d t h e p ro babi l i t y t ha t yo u a re d e a lt a s p a d e or a n o n d a s h p i c t u re c a r d .

פתרון

\frac{10}{13}

+1

עשרוני

0.76923 \dots

צעדי פתרון

Find the probability of you are dealt a spade:

\frac{1}{4}

Find the probability of a non dash picture card:

\frac{9}{13}

Find the probability of you are dealt a spade and a non dash picture card:

\frac{9}{52}

Use the Inclusion-Exclusion formula

P (X \lor Y) = P (X) + P (Y) - P (X \land Y)

= \frac{1}{4} + \frac{9}{13} - \frac{9}{52}

\frac{1}{4} + \frac{9}{13} - \frac{9}{52} = \frac{10}{13}

= \frac{10}{13}

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