Answer:A geometric sequence is a list of numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio.For example, in the sequence 2,6,18,54,..., the common ratio is 3, because each term is 3 times the previous one (6/2=3, 18/6=3, and so on).The formula for the nth term of a geometric sequence is:an = a1 • r^n-1wherea n is the nth terma1 is the first termr is the common ration is the number of the term