Delhi coaching centre – About the mistakes in the book

I want to attract your mind towards your various mistakes in the book. In exams, A question came and I solve it according to your method.
But I match it in other book and also consult with my teachers, they said, it was wrong. Your book deduct my marks which are very important four me.
please solve my this problem as soon as possible.
vipul verma(9034521202)

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