Sebuah Bilangan yang Habis Dibagi 7

Problem ini dikemukakan oleh Prof. R. Ramanujam (Institute of Mathematical Sciences Chennai, India) yang berkunjung ke FMIPA-ITB pada tanggal 20-21 Mei 2016:

Buktikan bahwa 55552222 + 22225555 habis dibagi 7.

*

Bandung, 21-05-2016

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