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2*(1^3+1) =4

4*(2^3-1)=28
6*(3^3+1)=168
8*(4^3-1)=504

10*(5^3+1)=1260


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2Â¥2009-11-18 08:52:27
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1*4 =4

4*7=28
28*6=168
168*3=504

504*2.5=1260
3Â¥2009-11-18 09:21:41
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ÒýÓûØÌû:
Originally posted by ÎÒÊÇÄãÐÖµÜ at 2009-11-18 08:52:
2*(1^3+1) =4

4*(2^3-1)=28
6*(3^3+1)=168
8*(4^3-1)=504

10*(5^3+1)=1260


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