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

A {1,3,4}

B {1,3,5}

C {1,2,3}

D {2,5}

Correct Answer: Option B

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