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About the Author:-
About the Author: Born on 2nd January, 1946, Dr. R. S. Aggarwal grew up in a village of Delhi. He completed his graduation from Kirori Mal College, Delhi. After obtaining his M.Sc. in Mathematics in 1969, he joined as a lecturer with N.A.S. College, Meerut. Later, in 1976, he was awarded a 3 year fellowship and joined Delhi University for its Ph. D. program. He joined M.M.H. College, Ghaziabad in 1999 as a reader and finally retired in 2003. Over the years, he has written around 75 books ranging from preschool to M. Sc. and also for competitive examinations from clerical grade to I.A.S. levels.