A parent-teacher committee consisting of 4 people is to be formed from 20 parents and 5 teachers.

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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. (Assume that the selection will be random.)
a. All teachers
b. 2 teachers and 2 parents
c. All parents
d. 1 teacher and 3 parents
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