(a) This is a case of bilateral mistake, each party believing something different about an important fact. The contract is likely to be set aside a void ab initio on these grounds.
(b) This is a case of unilateral mistake because only Sunny was mistaken. In all the known circumstances, it is unlikely that Tyler will be allowed to enforce this contract against Sunny.
(c) This is a case of unilateral mistake because only Sunny was mistaken. However, in the known circumstances, it is likely that Tyler will be allowed to enforce this contract against Sunny, despite her mistake.
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