Let ∪ = {x: x is a natural number and x ≤ 10}
A = {a: a is an even natural number and a < 10}
B = {b: b is a prime number and b ≤ 9}
Then AI ∩ BI is
{1,9,10}
U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
A = {2, 4, 6, 8}
B = {2, 3, 5, 7}
AI = U - A ≡ All the elements in U which does not belong to A
= {1, 3, 5, 7, 9, 10}
BI = U - B ≡ Elements which belongs to U and does not belong to B
= {1, 4, 6, 8, 9, 10}
AI ∩ BI = {1, 9, 10}