Question

Which of the following is a geometric sequence?
-24, 12, 6
-24,23,-22
-24, -12, 0
24, 12, 6

Answer 1

geometric progression----> yn/y(n-1)=y3/2=y2/y1=q

so the forth is a geometric progression and q=1/2

Answer 2

if a,b,c,d is a geometric sequence then:

d c b
-- = -- = --; right?
c b a