Answer :
(i) Let a = 4, b = -2, c = 1.
In GP, b2=ac
⇒ (-2)2 = 4.1
⇒ 4 = 4
Common ratio = r 
(ii) Let 
, b = -6, c = -54.
In GP, b2=ac
⇒ 
⇒ 36 = 36
Common ratio = r 
(iii) Let a = a, 
In GP, b2=ac
⇒ 
⇒ 
Common ratio 
(iv) Let 
In GP, b2=ac
⇒ 
⇒ 
Common ratio
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