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Mathematics, 20.02.2022 19:30 gd9075

I need help with this please? 2. A parent-teacher committee consisting of 4 people is to be formed from 20 parents and 5 teachers. Find the probability that the committee will consist of these people:
a. All teachers
b. 2 teachers and 2 parents
c. All parents
d. 1 teacher and 3 parents

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