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Not all a's are in (Posted on 2018-02-06) Difficulty: 2 of 5
A four-digit PIN number aabb, where a and b are distinct digits, is a multiple of 15.

Which values of a are not possible?

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
Puzzle AnswerK Sengupta2022-06-01 23:04:36
SolutionNo SubjectMark Hartman2018-02-07 17:44:17
re: Solution (spoil alert)armando2018-02-06 14:55:40
Solution (spoil alert)JayDeeKay2018-02-06 12:27:58
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