Question

format of formal, informal letter
email,notice
according to icse class 10
please help me out with this
tomorrow is my exam ​

Answer 1

1) Your Address. The return address should be written in the top right-hand corner of the letter. ...

1) Dear Sir or Madam, If you do not know the name of the person you are writing to, use this. ...

1) Yours Faithfully. If you do not know the name of the person, end the letter this way.

Informal letters are mainly used for personal communication. So they do not have to follow any specific pattern, format or conventions. They can be written as per the writer's wishes and the requirement of the situation. So the letter is written in a personal fashion in casual unassuming language.