Sir/Madam, I beg to state that, I am a student of class [Your class and section] at your school. I have my family function in Delhi and all of my family members are going to attend it. Hence, I am also leaving with them and will not be able to attend school from [start date] to [end date].
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Answer:
Sir/Madam, I beg to state that, I am a student of class [Your class and section] at your school. I have my family function in Delhi and all of my family members are going to attend it. Hence, I am also leaving with them and will not be able to attend school from [start date] to [end date].