Answer:
Step-by-step explanation:
This is a quadratic sequence.
The nth term must have .
The sequence has a factor of .
Few terms to this sequence are:
5, 20, 45, 80, 125, 180, 245, 320, 405, 500, 605, 720, 845, 980, 1125, 1280, 1445, 1620, 1805, 2000, 2205, 2420, 2645, 2880, 3125, 3380, 3645, 3920, 4205, 4500, 4805, 5120, 5445, 5780, ...
<u>c) 3, 6, 9 12</u> is NOT a geometric progression
<h3>Further explanation </h3>Geometry sequences are series of numbers that have a constant ratio
or can be interpreted:
Each number is obtained by multiplying the previous number by a constant
The sequence can be:
a, ar, ar², ar³, ... etc.
Can be formulated
where:
a is the first term, and
r is the common ratio
So we have to see the series has the same ratio or not
a.
b.
c.
d.
a geometric sequence
Determine whether the sequence below is a geometric
the formula for a finite geometric series
Keywords : a geometric sequence, the first term, the common ratio
