Wouldn't hold up in court.
Unilateral mistakes
A unilateral mistake is where only one party to a contract is mistaken as to the terms or subject-matter contained in a contract. This kind of mistake is more common than other types of mistake. One must first distinguish between mechanical calculations and business error when looking at unilateral mistake. For mechanical calculations, a party may be able to set aside the contract on these grounds provided that the other party does not try to take advantage of the mistake, or 'snatch up' the offer (involving a bargain that one did not intend to make, betrayed by an error in arithmetic etc.). This will be seen by an objective standard, or if a reasonable person would be able to know that the mistake would not make sense to one of the parties. Unless one of the parties 'snatched up' the one-sided offer, courts will otherwise uphold the contract.
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