2988. In the group there are 3 excellent students, 4 horoshistas and 5 troechnik. The dean´s office selected 3 students from the group for duty at the exhibition, and the selection was made randomly. Find the probability that among the selected students:
a) all excellent students;
b) at least one is good;
c) exactly two troechnik.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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