Legal Principle: Where both parties to an agreement are under a mistake as to matter of fact essential to the agreement, the agreement is void.Factual Situation: A had a piece of land. He believed that the value of the land was ` 1,000 per square foot. B knew that the value of the land was in fact ` 1,500 per square foot. However, he did not inform A and purchased the land at ` 1,000. (NLU DELHI 2010)

Each question consists of legal principle(s) (hereinafter referred to as 'principle') and facts. Such proposition may or may not be true in the real and legal sense, yet you have to conclusively assume them to be true for the purposes of this section. You have to apply the principles to the given facts to arrive at the most reasonable conclusion. Only one of the alternatives, i.e., (A), (B), (C), or (D) is the most reasonable conclusion. Remember: you must not rely on any principle except the principles that are given for every question.