question_answer

If \[X=\{{{4}^{n}}-3n-1:n\in N\}\] and \[Y=\{9\,\,(n-1):n\in N\}\], then \[X\bigcup Y\] is equal to

A)  X                                

B)  Y

C)  N                                

D)  All of these

E)  None of these