Answer: Common ratio is -3
Step-by-step explanation:
Given series is geometric progression series : -2,6,-18,54..
Also, General geometric progression series is represented as a,ar,a[tex]r^{2}[/tex],a[tex]r^{3}[/tex]......
In order to find common ratio r, we will take ratio of second and first term
= [tex]\frac{ar^{2}}{a}[/tex]
=[tex]\frac{+6}{-2}[/tex]
=-3
Correct answer is -3
