Final answer:
Out of the given statements, statements 2 and 3 are true for ill-structured problems.
Step-by-step explanation:
1) The statement 'Are always hard to solve' is false. Ill-structured problems can have varying levels of difficulty. Some may be easier to solve while others can be more challenging.
2) The statement 'Have a large number of rules' is false. Ill-structured problems may not have a fixed set of rules. They are often open-ended and require critical thinking and problem-solving skills.
3) The statement 'May have more than one correct answer' is true. Ill-structured problems are characterized by multiple possible solutions or interpretations. The outcome may depend on different perspectives and approaches.