1, assuming that A is right, then both B and C are wrong. Combining what they said, we can find that both B and C are right, and only one person's right is contradictory.

It is not right to assume that B is right and A and C are both right.

Suppose C is right, A is right and B is wrong.

So the answer is that A is right and C is right.

Think about solving problems:

In mathematics, multiple-choice questions are generally solved by exclusion. When we use the exclusion method to solve problems, we need to master all kinds of mathematical concepts and formulas, demonstrate the answers in the questions, and exclude the answers that do not conform to the argumentation relationship, so as to effectively solve mathematical problems.

When solving multiple-choice questions, we must read the questions and answers carefully, make a reasonable analysis of their relationship, and eliminate the conditions that do not meet the argumentation relationship through rigorous problem-solving ideas, so as to choose the correct answer.