Решение задачи N3606 теория вероятностей

3606. In two batches, 39 and 78% of good-quality products, respectively. Randomly choose one product from each batch. What is the probability to find among them: a) at least one defective; b) two defective; c) one benign and one defective?

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