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2個n次幂結果:2 4 8 16 32,說明末尾數是4個數的迴圈 3個n次幂結果:3 9 27 71 213,說明末尾數也是4個數的迴圈 1998/4=499餘2,說明2的1998次幂末尾結果是4,3的1998次幂末尾結果是9,相加後4+9=13,末尾數是3.
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