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= 2^2000 mod(7)
= 2^(3x666 + 2) mod(7)
= 2^2 . (2^3)^666 mod(7)
= 4 . 8^666 mod(7)
= 4 . 1 mod(7)
= 4 mod(7)
artinya 4 hari setelah hari selasa = sabtu