Let X 2 4 5 and Y 1 2 4 and R be a relation from X to Y defined-18572

Let X = {2, 4, 5} and Y= {1, 2, 4} and R be a relation from X to Y defined by R = {(2,4), (4,1), (a,2)}. For what value of 'a' the relation R is a function ?

This multiple choice question (MCQ) is related to the book/course vu mth202 Discrete Mathematics. It can also be found in vu mth202 Final Term - Quiz No.1.