Discrete Mathematics | Set Theory | Equivalent Relation

Question

Answer 1

P is true (a,b) R (a,b) where a>=a and b>=b

Q is true if in (a,b)R(c,d) a>b and c>d then (c,d)R(a,b)will never hold now c>a and d>b is not possible

R is true check urself

So ans is b,c,d