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play with digit (Posted on 2013-09-10) |
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Let A be a 2n-digit number whose digits are all 1's and let B be a n-digit number whose digits are all 2's.Show that A-B is a perfect square.
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![](/images/perplexus/icons/blob.gif) | solution | Daniel | 2013-09-10 10:16:02 |
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