Question 7
A room contains 26 people, each either always truthful or always lying. The first says, “There are no truthful people in this room.” The second says, “There is at most one truthful person in this room.” The third says, “There are at most two truthful people in this room.” This pattern continues, with the last saying, “There are at most 25 truthful people in this room.” How many truthful people are there?
