List all the elements of the following sets:
Substituting the values of n we will get the solutions
At n=1, 
At n=1, 
At n=1, 
At n=1, 
At n=1, 
∴ 
3
List all the elements of the following sets:
Substituting the values of n we will get the solutions
At n=1,
At n=1,
At n=1,
At n=1,
At n=1,
∴