1.The general term of a sequence is n^2. Show that it is not a geometric sequence.
2.The general term of a sequence is 2n^2 + 3.Show that it is not an arithmetic sequence.
F5 math problems (Sequence)
2007-09-25 3:17 am
回答 (1)
2007-09-25 3:27 am
✔ 最佳答案
1. T(1) = 1^2 = 1T(2) = 2^2 = 4
T(3) = 3^2 = 9
[T(2) / T(1)] is not equal to [T(3) / T(2)]
So it is not a geometric sequence
2. T(1) = 2(1^2) + 3 = 2 + 3 = 5
T(2) = 2(2^2) + 3 = 8 + 3 = 11
T(3) = 2(3^2) + 3 = 18+ 3 =21
[T(2) - T(1)] is not equal to [T(3) - T(2)]
So it is not an arithmetic sequence.
收錄日期: 2021-04-18 23:22:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070924000051KK02971