Answers

2016-07-03T15:13:44+08:00
I presume this is geometric means, so
Let 16 = a5 and 81 = a1
16 = 81*r^4
16/81 = r^4
r = 2/3 or -2/3

Case 1: 2/3
The 3 terms are: 54, 36, 24

Case 2: -2/3
The 3 terms are -54, 36, -24

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