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Rajesh Kumar Thakur, a postgraduate in Maths, Operation Research and Education, has been teaching secondary and senior secondary school students for the past twelve years.\r\nThe charm of numbers made him a lover of mathematics. He has been associated with many prestigious public schools in Delhi, Jharkhand and Rajasthan as a guest teacher of mathematics. He has written several books, and hundreds of his essays/articles have been published in many leading magazines and newspapers all over the country.