1. i dont think any such relation is possible coz if we make it symmetric and reflexive it will becum transitive too

c how

to make it reflexive lets add 1,1

and to make it symmetric we will have to add 2,1 and 3,1

now the relation contains (1,2)(2,1) (3,1)(1,3)(1,1)

now c 1,2 belongs to R

2,1 also belongs to R and 1,1 also belongs to R which makes it transitive...

the same will happen whn we add 2,2 or 3,3

so no such relation is possible