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misalnya ... 7mod3=1, artinya 7/3 = 2 + sisa 1
12mod3=0
8mod3=2
karena hari itu= 7 hari, jadi 1=selasa, 2=rabu .... dst
5^2000 : 7 = sisa ???
5^1 / 7= 0 sisa 5
5^2 / 7= 3 sisa 4
5^3 / 7= 17 sisa 6
5^4 / 7= 89 sisa 2
5^5 / 7= 449 sisa 3
5^6 / 7= 2232 sisa 1
5^7 / 7= 11166 sisa 5 terulang lagi
2000=2x2x2x2x5x5x5
5^2000 = 5^2 ,(5^2 .5^2 .5^2 .5^5 .5^5 .5^5)
====== =5^2 . 5^7 . 5^7 . 5^7 = sisa(3. 5 .5.5)= sisa(3.5^3) = sisa(3. 6) =18/7 = sisa 4.
hari 4 = Jumat