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The reflection of a positive integer is obtained by reversing the dig
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21 Jul 2024, 22:22
21 Jul 2024, 22:22
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The reflection of a positive integer is obtained by reversing the 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
A. 2
B. 4
C. 5
D. 6
E. 9
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Free Materials for the GRE General Exam - Where to get it!!
Shorter GRE - Preparing for the Quantitative Reasoning Measure
Shorter GRE - Preparing for the Verbal Reasoning Measure
The reflection of a positive integer is obtained by reversing the dig
[#permalink]
21 Jul 2024, 22:44
21 Jul 2024, 22:44
1
It took around 4 mins to solve this question, but this is the way is solved it
For all integers x, y, z, w and v
10000v+1000w+100z+10y+x
-(10000x+1000y+100z+10w+v)
-------------------------------------
9999v+990w+0-990y-9999x
If you put any integer for the variables if is always divisible by 9,
Since its a MUST BE question the option, we choose should always be correct.
Hence E should be the right answer.
For all integers x, y, z, w and v
10000v+1000w+100z+10y+x
-(10000x+1000y+100z+10w+v)
-------------------------------------
9999v+990w+0-990y-9999x
If you put any integer for the variables if is always divisible by 9,
Since its a MUST BE question the option, we choose should always be correct.
Hence E should be the right answer.
gmatclubot
The reflection of a positive integer is obtained by reversing the dig [#permalink]
21 Jul 2024, 22:44
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