Phiby mailed Pen an offer to buy his summer house with definite and certain terms and that was legal in all respects stating that it was good for 13 days.

Three days later she sent Pen a letter by certified mail (time stamped by the Postal Service at 2:15 P.M.) stating that the original offer was revoked. That evening Pen e-mailed acceptance of the offer to Phiby. She immediately phoned him to tell him that she had revoked the offer that afternoon, and that he would surely receive it in tomorrow's mail. 1- Is Phiby's revocation offer effective? Please explain your answer revocation's conditions. (60 marks)considering the 2- Decide if Phiby and Pen have a legally binding agreement in this case. (10 marks)