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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?

See The Solution Submitted by Old Original Oskar!    
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  Subject Author Date
AnswerK Sengupta2008-11-08 00:53:38
SolutionAnother solution without logsCharlie2006-12-04 09:11:08
SolutionAn easy way outFederico Kereki2006-12-03 17:51:41
SolutionSolution without logJLo2006-12-03 12:13:40
SolutionSome calculations (spoiler)Steve Herman2006-12-03 11:08:27
SolutionsolutionCharlie2006-12-03 11:05:20
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