Which of the following sequences are in G.P.? (vi) 120,60,30,18,…

Which of the following sequences are in G.P.?
(vi) 120,60,30,18,…
Solution :
First term (a)  = 120, common ratio
r  = t2/t1
  =  60/120
r  = 1/2
r  = t2/t1
  =  30/60
r = 1/2

Since the common ratios are same, it is geometric sequence.

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