Question

Find the 20th term of a geometric sequence if the first four terms are -1/2, 1/4,-1/8, and 1/16

Answer 1

Answer:

-10

Step-by-step explanation:

a=-1/2

d=(1/4)/(-1/2)=-1/2

20 th term = a + (20-1)d

= -1/2 +19(-1/2)

=-1/2-19/2

=-10