যদি U = {x : 0 < x ≤ 10, x ∈ N}, A = {x : x , 3 এর গুণিতক এবং x ≤ 10} হলে n(Ac) = কত?

যদি U = {x : 0 c) = কত? সমাধান: U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}A = {3, 6, 9}Ac = U - A= {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} - {3, 6, 9}= {1, 2, 4, 5, 7, 8, 10}n(Ac) = 7