The correct option is D R={(a,b):a+b=11:a,b∈A}
R={(a,b):a+b=8:a,b∈A}
R={(1,7),(3,5),(5,3),(7,1)}
It is not a void relation.
R={(a,b):2a+b=10:a,b∈A}
Here 2a is even and b is odd
∴2a+b can never be even.
It is a void relation.
R={(a,b):2ab=30:a,b∈A}
R={(3,5),(5,3)}
It is not a void relation.
R={(a,b):a+b=11:a,b∈A}
Here a and b is odd
∴a+b can never be odd.
It is a void relation.