If A = {x : x is a multiple of 5, x ≤ 30 and x ∈ N}
B = {1, 3, 7, 10, 12, 15, 18, 25} then find A⋂B

If U = {x : 1 ≤ x ≤ 10, x ∈ N}, A = {1, 3, 5, 7, 9} and B = {2, 3, 5, 9, 10} then find A'UB'.

Using Venn diagram verify (AUB)'=A'⋂B' 

Let C be the set of all circles in a plane and define a circle C is related to a circle C', if the radius of C is equal to the radius of C'

Let A be the set consisting of children and elders of a family. Let R be the relation defined by aRb if a is a sister of b.