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09-05-2020
Mathematics

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There are 10 students in a class: 6 boys and 4 girls. If the teacher picks a group of 3 at random, what is the probability that everyone in the group is girl?

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JLong88 JLong88

09-05-2020

Answer:

pick a group of 3 randomly: 10C3 = 120

pick a group of 3 girls: 4C3 = 4

Probability=4/120=1/30

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