Each person reported the same number of defective bulbs. Also note that the number of defective bulbs can increase or remain the same between two consecutive testings and there is at least one defective bulb. Find the following just after the 10th person finished his test.

1) What can be the minimum number of defective bulbs? What are the defective bulbs in this case?

2) What can be the maximum number of defective bulbs? What can be the maximum number of bulbs that can be found to be defective?