Required Mathematical Intelligence

Chapter 129 There Are Several Sick Dogs in the Village
There are 50 people in a village, each with a dog.Now I know that there are dogs in the village who are sick.Observe the condition of the dog once a day, but each person can only observe 49 other dogs, and cannot see his own dog. When he judges that his dog is a sick dog, he must shoot the sick dog, but everyone has the right to shoot his own dog. sick dog.On the first day, there were no gunshots, and on the second day, there were still no gunshots.On the third day, gunshots were heard.How many sick dogs are there in the village?
[Answer: If there is only one sick dog, then the owner of the sick dog will know that his dog is sick when he sees that the other 1 dogs are not sick on the first day, so there will be gunshots on the first day.If there are 49 sick dogs, the owners are A and B, and there is no gunfire on the first day, A will think as follows on the second day: If my dog ​​is not sick, then the 2 dogs B saw yesterday If they were all normal dogs, he would know his dog was sick and shoot.Why didn't he shoot?That means he saw my dog ​​was sick.So A will shoot the next day.Of course, in the same way, B will also shoot the next day.The actual situation is that the gunshots did not appear until the third day, so there must be 49 sick dogs. ]
(End of this chapter)