<h2>
Answer:</h2>
option: B is the correct answer.
B. complex numbers.
<h2>
Step-by-step explanation:</h2>
We know that a complex number is always written in the form of :
a+ib
where a and b are real numbers and i is the square root of -1.
i is called an imaginary number.
If a>0 and b>0 then the point lie in the first quadrant.
if a>0 and b<0 then the point lie in the fourth quadrant.
if a<0 and b>0 then the point lie in the second quadrant.
if a<0 and b<0 then the point lie in the third quadrant.
<h2>Common ratio = -1/2</h2>
Step-by-step explanation:
term of a Geometric progression is given as 
. The first term is given as 
.
Any general Geometric progression can be represented using the series 
.
The first term in such a GP is given by 
, common ratio by 
, and the 
term is given by 
.
In the given GP, 
∴ Common ratio is 
.
