[計量] The "reflection" of a positive …
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 *
（我硬是用數字去算，的確可以算出九這個答案，
但我想知道這題背後是不是其實有公式或邏輯在）
Which of the following Cannot be a factor of 2的i次方 and 3的j次方，
where i and j are positive integers ?
答案是 42
(我根本上有點不太懂題目要問什麼 冏)
麻煩強者了
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