Let A = {2, 3, 5, 7, 9}. Let R be the relation on A defined by xRy if and only if 2x ≤ 3y. Let l be the number of elements in R, and m be the minimum number of elements required to be added to R to make it a symmetric relation. Then l + m is equal to:

If R = {(1, 2), (2, 3), (3, 4)} is a relation from set A = {1, 2, 3} to set B = {2, 3, 4, 5}, then what are the domain and codomain of R?

If f(x) = √x and g(x) = 1x2, then find the domain of (f + g)(x).

A relation R = {(a, b) : a, b ∈ ℤ and a2 + 3b2 ≤ 10} is defined on the set of integers ℤ. Find the range set of relation R.