There are 21 girls and 33 boys in a classroom. I want to randomly select one student to become the class leader. If I want to find the probability that the selected student is a girl, the number of favourable outcomes is ___.

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Solution

I want to find the probability that a girl is selected.
$\Rightarrow$ A girl being selected is a favourable outcome.
Here, there are 21 girls. In other words, a girl can be selected in 21 ways.
$∴$ Number of favourable outcomes is 21.

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There are 21 girls and 33 boys in a classroom. I want to randomly select one student to become the class leader. If I want to find the probability that the selected student is a girl, the number of favourable outcomes is ___.

I want to find the probability that a girl is selected. ⇒ A girl being selected is a favourable outcome. Here, there are 21 girls. In other words, a girl can be selected in 21 ways. ∴ Number of favourable outcomes is 21.

I want to find the probability that a girl is selected.
$\Rightarrow$ A girl being selected is a favourable outcome.
Here, there are 21 girls. In other words, a girl can be selected in 21 ways.
$∴$ Number of favourable outcomes is 21.