Question

common ratio of G.P is

Answer 1

In a G.P, common ratio (r) = a$a_{2} / a_{1}$
$a_{2}$= -9/2
$a_{1}$=9/4
$a_{2} / a_{1}$=-9/2 / 9/4
                                   =-9/2*4/9
                                    = -2.
:. common ratio of the G.P is -2

Answer 2

GP = -9/2, 9/4, -9/8

A1 = -9/2. and A2 = 9/4

r = A2 / A1

= 9/4
____
-9/2

= 9/4 × 2/-9

= - 1/2

HOPE IT HELPSS U