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Question
A bag contains 5 white and 7 red balls. One ball is drawn at random. What is the probability that ball drawn is white?
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Solution
\[\text{ Number of white balls } = 5\]
\[\text{ Number of red balls }= 7\]
\[\text{ Total number of balls }= 5 + 7 = 12\]
\[ \therefore \text{ The total number of cases }= 12\]
\[\text{A gain, there are 5 white balls . Therefore, the number of favourable outcomes is 5 }. \]
\[ \therefore P\left( \text{ the drawn ball is white }\right) = \frac{\text{ Number of favourable cases }}{\text{ Total number of cases }} = \frac{5}{12}\]
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