When there is a unilateral mistake, in what three types of situations may a contract not be enforced? Explain your answer.

When there is a unilateral mistake, there are three types of situations in which a contract may not be enforced:

1. Mutual mistake: If both parties to the contract make the same mistake about a fundamental aspect of the agreement, the contract may not be enforced. For example, if both parties believed they were contracting for a specific item, but later discover that they were mistaken about the identity of the item, the contract may not be enforceable.

2. Unilateral mistake known to the other party: If one party to the contract is aware that the other party has made a mistake, yet takes advantage of that mistake, the contract may not be enforceable. This is because there is an expectation of good faith and fair dealing in contract law, and knowingly exploiting someone's mistake undermines that principle.

3. Unilateral mistake that is so significant: In some cases, a unilateral mistake that is so significant as to make the contract fundamentally unfair may render the contract unenforceable. This typically occurs when one party's mistake is so substantial that enforcing the contract would result in undue hardship or injustice.

To determine whether a contract can be enforced in these situations, it is important to consult legal resources such as statutes, court decisions, and legal experts. Consulting an attorney who specializes in contract law can provide detailed guidance based on the specific circumstances of the case.