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= 3^(2 x 62 + 1) mod10
= 3 * (3^2)^62 mod10
= 3 * (10 - 1)^62 mod10
= 3 * (1) mod10
= 3 mod10
jadi, satuan dari 3^125 = 3
akibatnya satuan dari 3^125 - 3 = 3 - 3 = 0