Ageometric sequence has a common ratio of 2/9 and the first term is 729 what is the 8th term?

This is the concept of sequences and series. The formula for geometric series is given by:
an=ar(n-1)
where;
a=first term
r=common ratio
n=nth term
thus the 8th term will be:
8th=728*(2/9)^(8-1)
=728*(2/9)^7
=128/6561

Understanding what? lol