Решение задачи N5277 теория вероятностей

5277. The warehouse received a batch of 30 parts, including 4 defective ones. 3 products are randomly selected from the batch for control. If there are more than 1 defective among the control ones, then the entire batch is rejected. Find the probability that the lot will be rejected.

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