1) If X={4n−3n−1:nϵN} and Y={9(n−1):nϵN} then X∩Y= A) X B) Y C) ϕ D) {0} Answer: Option AExplanation:We have , X={4n−3n−1:nϵN} = {0,9,54,........} and Y={9(n−1):nϵN} = {0,9,18,27,6,45,54.........} ∴ X∩Y= X