Which logical statement(s) below must be correct?

- Exactly one statement on this list is incorrect
- Exactly two statements on this list are incorrect
- Exactly three statements on this list are incorrect
- Exactly four statements on this list are incorrect
- Exactly five statements on this list are incorrect
- Exactly six statements on this list are incorrect
- Exactly seven statements on this list are incorrect
- Exactly eight statements on this list are incorrect
- Exactly nine statements on this list are incorrect

#### Solution

Only one statement can be correct, because each statement contradicts every other statement, which means the remaining eight statements must be incorrect – therefore only statement number 8 is correct.