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The "reflection" of a positive integer is obtained by [#permalink]
12 Dec 2003, 01:41
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?
I have chosen 2, e.g. 98721-12879 = 84942/2 = 42471.
But the answer is not. Can anyone try and explain the correct answer?
five digit integer 98721 the reflection is 12789, not 12879 or 85932 is the difference , as in this case it is divisible by 2,4,6,9 not divisible by 5, we can not say. Try 10000-00001=9999, think it is clear now..