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In a box there are 9 balls, 5 of them are white balls and 4 others are red balls so i decided to take 3 balls from the box. What is the probabilty i get at least 1 red ball?

 Jun 25, 2020
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In a box there are 9 balls, 5 of them are white balls and 4 others are red balls so i decided to take 3 balls from the box.

What is the probabilty i get at least 1 red ball?

 

\(\begin{array}{|rcll|} \hline && 1-\dfrac{5}{9}*\dfrac{4}{8}*\dfrac{3}{7} \\\\ &=& 1-\dfrac{60}{504} \\\\ &=& \mathbf{\dfrac{444}{504}} \\ \hline \end{array} \)

 

laugh

 
 Jun 26, 2020

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