TR-MO-R1 2013 Problem 32
Yalnızca , , rakamları kullanılarak, ilk ve son basamaklarında aynı rakam yer alan ve herhangi ardışık iki basamağında aynı rakam yer almayan kaç farklı basamaklı pozitif tam sayı yazılabilir?
a) b) c) d) e)
Official text Turkish Mathematical Olympiad, first round 2013 official paper, page 9. Quoted with source.
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