is it necessary to write the name of sender at the top of letter?

Dear Student,

Here is the sample format of formal and informal letters. In a formal letter, it is necessary to mention the name of the sender at the top. In an informal letter, it is not necessary to mention the same. However, if the address of the sender is given in  the question, you will be required to mention the same even in an informal letter.  

Sample format of a formal letter:


Sample format of an informal letter:

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