Решение задачи N5097 теория вероятностей

5097. 10 parts were received for assembly, 4 of which were defective. The assembler randomly takes three parts. Find probabilities of events:
A - all parts are defective;
B - only one part out of three is defective;
C - at least one of the parts taken is defective.

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)