Solution
Correct Answer: Option C
A = {x : x ∈ R এবং x2 - (a + b) x + ab = 0}
এবং B = {a, b, c}
এখানে
x2 - (a + b)x + ab = 0
x2 - ax - bx + ab = 0
x(x - a) - b(x - a) = 0
(x - a)(x - b) = 0
x = a, b
A ={a, b}
B = {a, b, c}
A ∪ B = {a, b} ∪ {a, b, c} = {a, b, c}