A geometric sequence is a sequence of numbers that follows a
pattern were the next term is found by multiplying by a constant
called the common ratio, r.
Write the first five terms of a geometric sequence in which
a1=2 and r=3.
We use the first given formula:
Just as with arithmetic series it is possible to find the sum of
a geometric series. It is found by using one of the following
Videolesson: use the formula for the sum of a
geometric series to determine the sum when a1=4 and r=2
and we have 12 terms.