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Mathematical Tricks (Personal Knowledge)
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12-22-2003, 09:56 AM
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Corneo
Insane
Back to the nine thing. Digits of mulitples of 9 alternate.
9
18
27
36
45
54
65
72
81
See how the 1 and 8 switch places, the 2 and 7 switched...
Corneo
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