Mathematics, 21.05.2020 12:59 wrestling2

Thee are 9 students in a class: 2 boys and 7 girls. If the teacher picks a group of 4 at random, what is the probability that everyone in the group is a girl?

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Thee are 9 students in a class: 2 boys and 7 girls. If the teacher picks a group of 4 at random, wha...