20 БАЛЛОВ

Выберите все гарантированно верные сравнения (a, b, c, d — цифры).


1.abcd≡d(mod2)
2.abcd≡cd(mod2)
3.abcd≡a+b+c+d(mod4)
4.abc≡d(mod4)
5.abcd≡cd(mod4)
6.abcd≡bcd(mod4)
7.abcd≡cd(mod8)
8.abcd≡bcd(mod8)
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