Answers

2014-08-22T11:14:48+08:00
5,15,45,135,405

sol'n:

5*3 =15
15*3=45
45*3=135
135*3=405
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2014-08-23T00:06:13+08:00
5*3= 15
15*3=45
45*3=135
135*3=405
405*3=1215

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