CLAT LLM 2010 Question Paper with answer key for online practice

A farmer crop is partially destroyed every year by crickets reads an advertisement addressed to farmers to save their crop from the menace of crickets asking them to send rupees five thousand for a machine to effectively kill crickets. A sends rupees five thousand and receives by mail one wooden block and a hammer with the instructions put a cricket on one block and hammer it and it will certainly die, repeat the performance till all the crickets are destroyed. A rightly alleges that the contract is not binding on him as his consent to purchase the machine was obtained through