TR-MO-R1 2017 Problem 21
rakamlarını kullanarak aynı olan rakamlar yan yana olmayacak şekilde oluşturulabilen beş basamaklı kaç farklı şifre vardır?
A) 980 B) 840 C) 720 D) 660 E) 580
Official text Turkish Mathematical Olympiad, first round 2017 official paper, page 13. Quoted with source.
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