【實用教育app】Number 1089|最夯免費app

This application proves below steps,

1. Take any three-digit number where the first and last digits differ by 2 or more.

2. Reverse the digits, and subtract the smaller from the larger one.

3. Add to this result the number produced by reversing its digits.

Result always is 1089!

To learn more facts about interesting numbers

Visit numberphile: http://www.youtube.com/user/numberphile

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