There are m boys and 12 girls in a class. What is the probability of selecting at random a girl from the class?
- Number of favourable outcomes = number of girls = 12
- Total number of possible outcomes = total students = m boys + 12 girls = m + 12
Therefore,
Probability of selecting a girl = \(\dfrac{\text{Number of girls}}{\text{Total number of students}} = \dfrac{12}{m + 12}\).
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