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The difference of a number consisting of two digits from the number formed by interchanging the digits is always divisible by :
Answer & Solution
Correct Answer:
Option
B
Let the number = 10x + y
Interchange number = 10y + x
Difference
= 10x + y - 10y - x
= 9 (x - y)
The difference is always divisible by 9
Interchange number = 10y + x
Difference
= 10x + y - 10y - x
= 9 (x - y)
The difference is always divisible by 9
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