[計量] PP3的題目
The "reflection" of a positive integer is obtained by reversing its digits.
For example, 321 is the reflection of 123. The difference between a
five-digit integer and its reflection must be divisible by which of the
following?
(A) 2 (B) 4 (C) 5 (D) 6 (E) 9
我算出來結果是答案A和答案E都可以
因為差值是偶數 所以我就選了A 結果答案是E
我的算法是54321-12345=41976
請問各位版友 我是哪裡算錯了呢?
謝謝
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