The sequence is
.
The first term is
.
The nth term and the
st term of the sequence
are
and 
The ratio(r) = 
(Substitute r =
and
)
(Substitute r =
and
)
(Substitute r =
and
)
The ratio of successive terms is the nonzero constant 2,
\The sequence
is geometric with common ratio
.
The sequence
is geometric with common ratio
.
first four terms are 