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Which of the following sequences are in G.P.? (v) 1, −5, 25, −125,…
Which of the following sequences are in G.P.?
(v) 1, −5, 25, −125,…
Solution :
First term (a) = 1/3, common ratio
r = t
2
/t
1
= -5/1
r = -5
r = t
2
/t
1
= 25/(-5)
r = -5
Since the common ratios are same, it is geometric sequence.
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