The easiest problems in Mathematics in IITJEE, ISI Entrance Examination, AIEEE, DCE Entrance Examination and Mathematics Olympiads are always from Permutations and Combinations, and Probability, but the irony is that most of the students do not attempt them correctly.  And a greater irony is that solution to these problems does not require any pre-requisites, except cleverness. This book is aimed at driving presisely this point home.

        The aim of the book is to teach you consistent and clear thinking, that is, how not to confuse cause and consequence, how to analyse all the cases of a problem, skipping none, and how to build up a chain of propositions properly.