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7^2 : 10 sisa 9
7^3 :10 sisa 3
7^4 : 10 sisa 1
7^5 : 10 sisa 7
berulang setiap 4 kali.
1231:4 sisa 3. jadi sisa pembagian 7^1231: 10 sama dengan sisa pembagian 7^3: 10, yaitu 3