This one is best if you have a sheet of paper and a pencil and a nearby calculator.
Think of any three-digit number and make sure that the first and last digits differ by at least two.
By Wayne Kawamoto, About.com
This one is best if you have a sheet of paper and a pencil and a nearby calculator.
Think of any three-digit number and make sure that the first and last digits differ by at least two.
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