Special Class Railway Apprentice (SCRA) is conducted by UPSC (Union Public Service Commission) on behalf of Indian Railways for four years of apprenticeship. On successfully completing the same, SCRA are absorbed as a Class-1 officers in Indian Railway Service of Mechanical Engineering (IRSME).
Concept of a set, Union and Intersection of sets, Complement of a set, Null set, Universal set and Power set, Venn diagrams and simple applications. Cartesian product of two sets, relation and mapping - examples, Binary operation on a set - examples. Representation of real numbers on a line.