Question

find relation R if A={1,2,3,4}where R={(x,y):x^2+y^2<20}

Answer 1

Answer:

As the total number of Relations that can be defined from a set A to B is the number of possible subsets of A×B. If n(A)=p and n(B)=q then n(A×B)=pq and the number of subsets of A×B = 2pq.