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Duplicate Digit Determination (Posted on 2006-12-03) Difficulty: 3 of 5
If 2^P and 5^P start with the same (non-zero) digit for positive integer P, what is that digit? Can you prove it must be so?

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Answer Comment 6 of 6 |
The required common first digit of 2^P and 5^P is 3.
  Posted by K Sengupta on 2008-11-08 00:53:38
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