Mar 9, 2007

Amazing Trick

x= first 3 digits of phone number
y= last 4 digits

=[250(80x+1) + (2y - 250)] / 2
=[20000x + 250 + 2y - 250] / 2
=[20000x + 2y] / 2
= 10000x + y
= your phone number :)

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