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 pattern discovery, missing element technique, similarity increase technique, principle of zero sum of square terms, sum of inverses conversion, matching target and given expression, and simplification speed techniques. 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 51, Algebra 12 from SureSolv.com.