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1)

If  X={4n3n1:nϵN}  and  Y={9(n1):nϵN}  then XY


A) X

B) Y

C) ϕ

D) {0}

Answer:

Option A

Explanation:

We have , 

   X={4n3n1:nϵN} 

   = {0,9,54,........}

and   Y={9(n1):nϵN}

      = {0,9,18,27,6,45,54.........}

     XY=   X