Question

Let A={1,2,3....9} and R be the relation in AxA defined by (a,b)R(c,d) if a+d=b+c for (a,b),(c,d) in AxA.Prove that R is an equivalence relation and also obtain the equivalent class[(2,5)].

Answer 1

Answer:

Jassen Beration

.

Show that the set natural number Or the set of

positive integer does not form

a group under addition and multiplication