Answers

2016-07-25T21:06:56+08:00
1,1,2,3,5,8,...is arithmetic
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Common Difference?
there's no common difference or common ratio of a harmonic sequence
2016-07-25T21:18:21+08:00
1,1,2,3,5,8..., is not an arithmetic or geometric sequence 
                      it is harmonic sequence.

:)elvie

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