Let A = {1, 2, 3, 4, 6}. Let R be the relation on A defined by

(i) We are provided with the fact that,

A {1,2,3,4,6},R= {(a,b) : a,b ∈ A,bis exactly divisible by a}

Using the conditions given in the problem, we get,

R {(1,1),(1,2),(1,3),(1,4),(1,6),(2,2),

(2,4),(2,6),(3,3),(3,6),(4,4),(6,6)}

And this is the roster form of the relation.

(ii)  We are provided with the fact that,

A {1,2,3,4,6}, R= {(a,b) : a,b ∈ A,bis exactly divisible by a}

We can clearly see, the domain of R is, {1,2,3,4,6}

(iii) 

 We are provided with the fact that,

A {1,2,3,4,6}, R= {(a,b) : a,b ∈ A,bis exactly divisible by a}

And similarly, the range of R is, {1,2,3,4,6}