Show that any positive integer is of the form 4q+1 or 4q+3 where q is a positive integer

Show that any positive integer is of the form 4q+1 or 4q+3 where q is

1.	Show that any positive integer is of the form 4q+1 or 4q+3 where q is a positive integer
Answer» Page number six of the book Rs Aggarwal