find the general term for this geometric sequence
T(2) =243 , T(5) =1/3
geometric sequence ..really urgent...PLEASE!
2008-09-09 7:54 am
回答 (2)
2008-09-09 8:05 am
✔ 最佳答案
Let a and d be the first term and the common ratio respectively.
T(n) = arn-1
T(2):
ar = 243 ...... (1)
T(5):
ar4 = (1/3) ...... (2)
(2)/(1):
r3 = 1/729
r = 1/9
Put r = 9 into (1)
a(1/9) = 243
a = 2187
Hence, the general term T(n) = 2187 x (1/9)n-1
=
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