Answers

2016-07-13T19:45:19+08:00
Notice that the common ratio is 10

1st: 3/20
2nd: 3/20 * 10 = 3/2
3rd: 3/2 * 10 = 15
4th: 15 * 10 = 150
5th: 150 * 10 = 1500
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