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# probability

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There are 32 students in the Classroom. There 12 boys and 20 girls. She needs to select two students to represent her class .She will put all students names on a piece of paper and randomly select two names, one after the other. What is the probability that she will select a boy first and then a girl?

Dec 12, 2018

#1
+22152
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There are 32 students in the Classroom. There 12 boys and 20 girls.

She needs to select two students to represent her class .

She will put all students names on a piece of paper and randomly select two names, one after the other.

What is the probability that she will select a boy first and then a girl?

$$\dfrac{12}{32}\times \dfrac{20}{31} = 0.24193548387\quad (24.2\ \%)$$

Dec 12, 2018

#1
+22152
+10

There are 32 students in the Classroom. There 12 boys and 20 girls.

She needs to select two students to represent her class .

She will put all students names on a piece of paper and randomly select two names, one after the other.

What is the probability that she will select a boy first and then a girl?

$$\dfrac{12}{32}\times \dfrac{20}{31} = 0.24193548387\quad (24.2\ \%)$$

heureka Dec 12, 2018