[administration]

Q. The greatest number that always divides the difference of the number and the number formed by reversing its digits ?
A.18
B.27
C.36
D.45
please tell the approach?

Q asked by Vikram Kumar

[Wonder Boy]

Let the original number 10X+Y
number formed by reversing its digit =  10Y+ X
now the difference (10Y+X) – (10X+Y) = 9Y-9X = 9 (Y-X)
so the number will be divisibe by 9

[Author]

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