U = {x : x < 9 , x ∈ N}, A = {x : x ∈ N এবং 4 ≤ x ≤ 6} হলে A' = কত?

প্রশ্ন: U = {x : x < 9 , x ∈ N}, A = {x : x ∈ N এবং 4 ≤ x ≤ 6} হলে A' = কত?

সমাধান:
U = {x : x < 9, x ∈ N}
U = {1, 2, 3, 4, 5, 6, 7, 8}

A = {x : x ∈ N এবং 4 ≤ x ≤ 6}
A = {4, 5, 6}

A' = U - A
= {1, 2, 3, 4, 5, 6, 7, 8} - {4, 5, 6}
= {1, 2, 3, 7, 8}