Saturday, September 5, 2015

73 : 55 : 220





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4th Star Number = 73
4+5+6+7+8+9+2+4+5+6+8+9 = 73

0+1+2+3+4+5+6+7+8+9+10 = 55
(0+1+2+3+4+5+6+7+8+9+10) x4 = 220

10th Tetrahedral Number = 220
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