In a formal letter, the sender's address is typically written (2) above the date.

In a formal letter, the sender's address is usually placed above the date to provide the recipient with information about the sender's location and contact details. This allows the recipient to respond or contact the sender if necessary. It is a common practice in formal letter formatting and helps in establishing proper communication and contact between the sender and the recipient. This order of elements in a formal letter ensures clarity and professionalism.