The five problems are not easy but could all be solved quickly enough by pattern discovery and application of suitable techniques. This set of solutions is rich in learning. The solutions and concepts are explained in details. Important concepts used are mathematical reasoning, pattern discovery, strategy of algebraic expression simplification, sum of inverses conversion, sum of cubes modified expansion, split-up cube of sum, denominator similarity increase, dummy variable substitution, quadratic equation factorization, and abstraction. The Concepts and Techniques form the BASIC SKILLSET for solving harder algebra problems EASILY IN MIND.
These are the first 5 questions 1 to 5 and form the 1st part of video on the article SSC CGL Solution set 45, Algebra 11 from SureSolv.com.