Show that any positive odd integer is of the form 6q + 1, or 6q + 3, or 6q + 5, where q is
some integer.
Let a be any positive integer
a=6q+r where 0 < or = r < 6
put r=1:
a=6q+1
which is an odd integer
r=3:
a=6q+3
which is an odd integer
r=5:
a=6q+5
which is an odd integer
therefore, any positive odd integer is of form 6q+1,6q+3 or 6q+5, where q is some integer.