সার্বিক সেট U ={1,2,3,4,5,}, A = {1,2,4}, B = {1,3,5} হলে A'\( \cup \)B' কত হবে ?

A {1,2,3}

B {2,3,4}

C {3,4,5}

D {2,3,4,5}

Correct Answer: Option D

A' = U - A = {1, 2, 3, 4, 5} - {1, 2, 4} = {3, 5}
B' = U - B = {1, 2, 3, 4, 5} - {1, 3, 5} = {2, 4}
A' ∪ B' = {3, 5} ∪ {2, 4} = {2, 3, 4, 5}