Answers

2016-07-18T23:14:40+08:00
2,4,8,16,32 r= 2
800, 400, 200, 100, 50 r=1/2
10,20,40,80,160 r=2
4/3, 4, 12, 36, 108 r=3
3125, 625, 125,25,5 r= 1/5
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