THX
更新1:
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F.5 Maths Sequence
2009-09-20 9:27 pm
The sum to the nth term of a geometric sequence is (3^n -1)/2. Find the general term.
THX
THX
回答 (1)
2009-09-20 9:40 pm
✔ 最佳答案
(3^n - 1)/2 = (3^n - 1)/(3 - 1).so 1st term is 1, common ratio is 3
general term is 3^(n - 1).
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https://hk.answers.yahoo.com/question/index?qid=20090920000051KK00792